You're worn out. I'm guessing it's been too long since you ate, too. If you keep pushing yourself in this state you'll just make things worse.

You deserve to take care of yourself. It won't do you or anyone else any good to keep beating yourself up. Come on. Eat. Rest. Get away from all this for a little while. Your problems aren't going to get any bigger in the meantime - but you'll be better able to deal with them.