Yeah.... I've felt like that all day. It seems to help to force yourself to do things that are productive. I always feel a small sense of accomplishment after wards, which improves my state of mind a bit. Like today, I made myself sit down and do my math homework. It was really difficult to concetrate at first, but before I knew it, the math took over my mind and I finished it no problem. It was actually a nice little escape.

Hope you feel better!