To clarify: Mental Health diagnoses don't stack, and they aren't always permanent.
I don't go around saying, "Yeah, I have H1N1, Swine Flu, Influenza, Human Adenovirus 3, Rhinovirus, a cold, Streptococcus, Bronchitis, Pneumonia, and Mononucleosis." No. I've been diagnosed with those things at different time, or suspected of having them, or even treated for them while waiting confirmation tests to come back. Everyone would look at me like I'm out of my mind if I said that (and realize that there were some repeats in there). most people know better.
But when a person says, "Yeah, I have Bipolar, Manic-Depressive Disorder, Antisocial Personality Disorder, OCD, ODD, Schizophrenia, Multiple Personality Disorder, Dissociative Personality disorder, and Depression," people just accept that, that whole thing was stamped and sealed by a psychologist/psychiatrist. "Oh, that shrink is an idiot." No, you're a fucknut.
Those kinds of people like to wear every diagnosis they've ever hear drift anywhere near them like a goddamn badge. From there, they either use it as an excuse to not try to change their situation, or some trumped up "look at my really cool diagnosis, now listen to me rant about how much bullshit these diagnoses are".
Lemme guess: 10 years ago, a school counselor might have asked your parents to have you checked for Manic-Depressive disorder. So you just sew that badge onto your little sash and carry on. A few years later, you tell a doctor in your medical history that you've been diagnosed with Manic-Depressive disorder, so he does a general survey and tells you he's checking for Bipolar (which is the same fucking thing) before considering meds. You add that merit badge to your sash too (with a med-attempt bonus!), but you have to be cool and try to answer the questions like they do in movies all ironically and defiant. Your results are skewed, and you act like a moronic asshole, so the doctor speculates about Antisocial Personality Disorder and Oppositional-Defiant Disorder. You see them on worksheet, and Bam! A few months later, you get high and look up Dissociative disorders. Fuck yeah! Gotta catch 'em all!
A few years later, "Yeah, psychology is bullshit man, I was sent to all these 'professionals' who said I had all this shit and like they wanted to put me on meds, but I was all 'nah man, this shit is whack, yo', I turned out just fine. Huh, fuckin' showed them... ...dude, they told you that you had Depression? And you're taking meds for that shit?! Fuck man, you don't need that. You're acting like a sheep."