Let's see...my biggest problem is my social anxiety and some generalized anxiety disorder. Sometimes I have it under control and I don't even notice it, other times it drives me up the wall, freaking out and afraid. For a very LONG time I couldn't go to a grocery store by myself, because I was scared and though I can go unaccompanied today, I still get frustrated and irritated very easily being surronded by people.
I often see my social anxiety as a diseased part of my brain, seperate from me, because I personally do not give a shit what anyone thinks about me, I couldn't care less, but then that diseased part of my head starts making me feel insecure and MAKING me care what others think. Making worry that I look stupid or ugly or wierd and making life generally suck.
Not to mention my generalized anxiety means that I often am making up horrible scenarios in my head, "what if my house burns down while I'm away?" "I'm feeling really sick, could this be some horrible disease? Could I be dead in the morning?" I have had nightmares about family members and friends dying. Usually the only thing I can do to put that shit out of my mind is to escape through games, books, whatever, forcing myself to focus on something else that my mind can calm itself and return to a more stable place.
There's plenty more because I am just a gold mine of fuck upery, but I think I'll leave it at that since this post is already kind of long.