I haven't been diagnosed with a mental illness (yet....) Thomas Szasz nails psychiatry in Reason magazine. The following section is illustrative of his tack:

...For many years psychiatrists imprisoned homosexuals and tried to "cure" them; now they self-righteously proclaim that homosexuality is normal and diagnose people who oppose that view as "homophobic." Psychiatrists diagnose the person who eats too much as suffering from "bulimia" and the person who eats too little as suffering from "anorexia nervosa." Similarly, the person who has too much sex suffers from "sex addiction," while the person who shows too little interest in sex suffers from "sexual aversion disorder." Yet psychiatrists do not consider celibacy a form of mental illness; celibate persons are not said to suffer from "anerotica nervosa."

For me insanity is like porn-I know it when I see it (for instance, if a guy gnaws off his own penis for the hell of it-now that's insane). (For me-psychiatry has a strong element of "story-telling" in it-just like stock analysis or meta-history)