There are any number of things that could be wrong with you, including just being a little "burned out" for the moment.
The thing that is a bit frightening is that you mention that it is now affecting your appearance and, from what you describe, possibly your everyday life. That's basically what constitutes a psychological problem; a situation going from "annoying" to affecting the way you operate daily.
Perhaps try sitting down and drawing out a schedule of things that need to get done and go about them in an orderly manner. Effective time management can be a HUGE help. I know for myself if I let too many things pile up it compounds the problem because the "to do" list gets to the point where you so no way of tackling it.
I'm no psychologist (yet

) but if it gets any worse I suggest going to see a campus health center for they usually have a psychologist on hand to deal with things like stress. Deal with the problem before it becomes too damaging.
Originally posted by BurntRubber:
My mom got so stressed out once she wound up getting Bell's Palsy...she was just under a lot of pressure and had no way of releasing it and it wound up affecting her physically. She got better of course but during that time it was hard for her!
That brings up another good point; your mind and body are incredibly intertwined. If you feel downtrodden and mopey enough, your health (immune system) will become adversely affected as well.