Kendall,

When I am in the depths of despair, I try to do one thing that I love doing, even if I'm crummy at it--like painting or something. For me, the result doesn't matter one whit, it is the process. So, maybe along with all the other great advice, try doing something, anything, that takes concentration. If you concentrate on the process it crowds out whatever is bugging you. Even if it's temporary.