I think my constant overanalyzing is my greatest downfall, personality wise.
I tend to overanalyze things, like my BP diagnosis. I constantly think about why I'm not BP, and I come up with weird reasons to convince myself I don't have it. Same thing with anxiety and such.
I also overanalyze the hell out of things at work. I used to do it a lot in school, too. I've always screwed myself over with overanalyzing things!