psychochondria
Parallel to hypochondria - a person who is abnormally anxious about their mental health. Someone who will self-diagnose themselves and/or state they have multiple psychological "disorders" either all at once or continuously over time.
My girlfriend, Debbie Downer, thinks she has BED, ADD, OCD and bi-polar depression but she's never been to a doctor. I'm pretty sure she's just likes to eat, is lazy but likes things in order and is a party pooper. It's probably just a case of psychochondria.