I have a couple diagnosed mental problems (ADD, mild-severe depression), as well as a few minor phys. ones like asthma. However, I refuse medication because 16 years gives you so much practice at dealing with things, and because I don't have the dang money, and because my family already thinks I'm screwed up enough as is.
So back when I was seeing a psychologist, I never let on about the fact that I also have MPD, rage problems, schizophrenic tendencies (auditory, visually, and mentally) , and various bordering-on-obsessive-compulsive tendencies, not to mention what may/may not count as an eating disorder. I'm also terrified of telling any legal officials this because they could put me under supervision or stick me in a mental hospital, and I can function about as well as your "normal" average everyday person, and being in places like that would drive me crazier than I already am.
*hide*
(But I don't think that's had too much influence on the furryness. I was that way at least a year before everything started happening when I was 5.)