This is what came up when I typed "healer" in The Online Etymology Dictionary
"Rasputin" acquired name (Rus., lit. "debauchee") of Grigory Yefimovich Novykh (c.1872-1916), mystic and faith healer who held away over court of Nicholas II of Russia. His nickname is from his doctrine of "rebirth through sin," that true holy communion must be proceeded by immersion in sin. His name used figuratively in Eng. from 1937 for anyone felt to have an insidious and corrupting influence.
"-iatric" from Gk. iatrikos "healing," from iatros "physician, healer," related to iatreuo "treat medically," from iaomai "to cure," from iaino "heat, warm, cheer."
"savior" c.1300, "one who delivers or rescues from peril," also a title of Jesus Christ, from O.Fr. sauveour, from L.L. salvatorem (nom. salvator) "a saver, preserver" (cf. Sp. salvador, It. salvatore), from salvatus, pp. of salvare "to save" (see save (v.)). In Christian sense, translation of Gk. soter "savior." Replaced O.E. hælend "healer."
"faith" c.1250, "duty of fulfilling one's trust," from O.Fr. feid, from L. fides "trust, belief," from root of fidere "to trust," from PIE base *bhidh-/*bhoidh- (cf. Gk. pistis; see bid). For sense evolution, see belief. Theological sense is from 1382; religions called faiths since c.1300. Faith-healer is from 1885.
"castor" "beaver," 1398, from O.Fr. castor, from L. castor "beaver," from Gk. Kastor "he who excels," one of the divine twins (with Pollux), worshipped by women in ancient Greece as a healer and preserver from disease. His name was given to secretions of the animal, used medicinally in ancient times. Through this association his name replaced the native L. word for "beaver," which was fiber. Modern castor oil is first recorded 1746; it is made from seeds of the plant Ricinus communis but supposedly possesses qualities (and taste) similar to those of beaver juice, and thus so named.
"leech" (2) obsolete for "physician," from O.E. læce, from O.Dan. læke, from P.Gmc. *lælijaz "healer, physician" (cf. O.N. læknir, O.H.G. lahhi, Goth. lekeis "physician"), lit. "one who counsels," perhaps connected with a root found in Celt. (cf. Ir. liaig "charmer, exorcist, physician") and/or Slavic (cf. Serbo-Croatian lijekar), with an original sense of "speak, talk, whisper, conjurer." The form and sense merged with leech (1) in M.E. by folk etymology. In 17c., leech usually was applied only to veterinary practitioners. The third finger of the hand, in O.E., was læcfinger, translating L. digitus medicus, Gk. daktylus iatrikos, supposedly because a vein from that finger stretches straight to the heart.
"Christ" O.E. crist, from L. Christus, from Gk. khristos "the anointed" (translation of Heb. mashiah, see messiah), from khriein "to rub, anoint," title given to Jesus of Nazareth. The L. term drove out O.E. hæland "healer" as the preferred descriptive term for Jesus. A title, treated as a proper name in O.E., but not regularly capitalized until 17c. Pronunciation with long -i- is result of Ir. missionary work in England, 7c.-8c. The Ch- form, regular since c.1500, was rare before. Christmas is O.E. Cristes mæsse and retains original vowel sound; Father Christmas first attested in a carol attributed to Richard Smart, Rector of Plymtree (Devon) from 1435-77. Christmas tree first attested 1835 in Amer.Eng., from Ger. Weihnachtsbaum. Christmas cards first designed 1843, popular by 1860s.
"hag" c.1225, shortening of O.E. hægtesse "witch, fury" (on assumption that -tesse was a suffix), from P.Gmc. *hagatusjon-, of unknown origin. Similar shortening derived Du. heks, Ger. Hexe "witch" from cognate M.Du. haghetisse, O.H.G. hagzusa. First element is probably cognate with O.E. haga "enclosure" (see hedge). O.N. had tunriða and O.H.G. zunritha, both lit. "hedge-rider," used of witches and ghosts. Or second element may be connected with Norw. tysja "fairy, crippled woman," Gaul. dusius "demon," Lith. dvasia "spirit," from PIE *dhewes- "to fly about, smoke, be scattered, vanish." One of the magic words for which there is no male form, suggesting its original meaning was close to "diviner, soothsayer," which were always female in northern European paganism, and hægtesse seem at one time to have meant "woman of prophetic and oracular powers" (Ælfric uses it to render the Gk. "pythoness," the source of the Delphic oracle), a figure greatly feared and respected. Later, the word was used of village wise women. Haga is also the haw- in hawthorn, which is a central plant in northern European pagan religion. There may be several layers of folk-etymology here. If the hægtesse was once a powerful supernatural woman (in Norse it is an alternate word for Norns, the three weird sisters, the equivalent of the Fates), it may have originally carried the hawthorn sense. Later, when the pagan magic was reduced to local scatterings, it might have had the sense of "hedge-rider," or "she who straddles the hedge," because the hedge was the boundary between the "civilized" world of the village and the wild world beyond. The hægtesse would have a foot in each reality. Even later, when it meant the local healer and root collector, living in the open and moving from village to village, it may have had the mildly pejorative sense of hedge- in M.E. (hedge-priest, etc.), suggesting an itinerant sleeping under bushes, perhaps. The same word could have contained all three senses before being reduced to its modern one.
Anyone can call him or herself a healer, hang out a virtual shingle, and then fleece victims faster than a televangelist with a list of fresh phone numbers. Before handing over money to anyone, please check them out first. It is easy to do. Just type their name in quotes into Google, for example-- "Possible G. Scammer" and see what comes up. If they are in the business of making money instead of healing, then the sites that come up will reveal that all too easily. For local checks, contact your Better Business Bureau. If they've made a business of ripping people off, there will be complaints against them. Ask your friends, family, co-workers and acquaintances if they've had any experiences, negative or positive, about someone you are considering. Sad as it is, there are people out there who are in business solely to take advantage of desperate people. The first clue is that money is first on their list of requirements for healing. They offer nothing for free. Their websites have no useful information other than how to pay them. A legitimate healer will answer any questions you have before asking for money. Many work for free or for small renumerations/gifts. They provide lists of resources so you can learn more, check out their competition, and make an educated decision on whether to part with your hard earned money. Many of them also have a natural gift, or have trained with masters in their field. Those who value healing more than wealth will have reasonable prices and realistic projections for your healing. In general, if you feel they are treating you like a used car that needs to be moved off the lot before it breaks down and lets others know there's nothing but junk to be had, roll yourself over to someone more ethical.
At the same time, recognize there is a difference between those who call themselves "healers," and those who are trained therapists who have spent years and lots of tuition studying their craft, and are often certified by a guild or union. They deserve to be paid for their specialized training. In their case, you are paying to benefit from skills they have trained to pass on to others. Ask to see their certifications and credentials, and then pay them happily and willingly because they have earned the right to be paid.
And finally, all healing begins from within. Look to what is and is not in your heart first and you will know what needs healing. After that it is merely a choice who you want to partner with in your personal path to spirtual, emotional, and physical healing.
Disclaimer: I make no claim to the effectiveness of these links. I selected them because either I or someone I know has personally benefitted from them. Or I just thought they were weird enough to be interesting to others and they remain untried except in my imagination.