Now a professional might be the best person for this kind of thing, but if you know a friend who is willing to listen and spend time with you to advert your thoughts away from all the stimuli and get you concentrating on social interaction that might help.
Medication can mess you up really bad too, even though sometimes people need it, sometimes it is the problem. Taking more than you should could cause the problems to become worse, even if a little helps alleviate them. It's weird like that and their effects can last days after taking them.
I know the feeling you described. I've been depressed before and taken some Zoloft. I've also experience anxiety attacks during hangovers and utter loss of purpose and self. At a young age I spent a day obsessing about symmetrical touching, having to touch or scratch one part of my body and matching it on the other side. Drive me up a wall that whole day until I buckled up and logically attacked the idea of being able to achieve symmetry.
The mind is an odd thing, but one can overcome it. It is also important to eat healthy. Fresh fruits and vegetables, limit animal protein consumption, try to eat closer to 50% raw food intact, and don't get most of your calories from grains. Keep it diverse as well. It can take months for a healthy diet to start effecting you.
Before the PS3 everyone was nice to me :(
