I have some singularly unflattering suggestions for you.
For the medically pretentious overtones: Quack
a person who pretends, professionally or publicly, to skill, knowledge, or qualifications he or she does not possess; a charlatan.
More of the fraudster type: Charlatan
A person falsely claiming to have a special knowledge or skill:
a self-confessed con artist and charlatan
Perhaps the most neutral of the bunch: Pretender
a person who makes unjustified or false claims, statements, etc., as about personal status, abilities, intentions, or the like:
a pretender to literary genius.