The claims for successful self-treatment correlate highly with claims of self-diagnosis, with both claims being unvalidated by anyone else.
For example, a person might claim to have diagnosed her own autistic spectrum disorder after reading a Wikipedia article and taken an online test; and then she might further claim to have cured her ASD with a steady diet of non-glutenous foods, such as legumes, fruit and rice. Then she might brag about how awesome her alleged cure is without ever revealing any details, while simultaneously attacking the character and intelligence of anyone who requests those details
Such a person either believes her own lies or knows that she's lying. If the former, then she is deluded. If the latter, then she is either a troll, an attention wh_re, or a scam artist trying to fool people into giving her money for further research ... which never seems to produce results ...
In any case, and for whatever reason, the person making claims of an accurate self-diagnosis AND and effective self-treatment seems more interested in being believed than in providing proof.
Ignore such people. They're a waste of oxygen.
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The mere fact that science may not yet adequately explain an object, event, or experience does not mean the immediate explanation should automatically default to a conspiratorial, extraterrestrial, paranormal, or supernatural cause.