Hi Kelly!
I know exactly how you feel right now.

I'm in the same place. So I'm going to give you the same advice I'm following for myself. I definately would not completely give up, but in stead of obsessing and stressing about it. Just go about your life, classes and such with the only objective to make healthy choices. Making healthy food choices, walk when you can, take stares instead of an elevator and such. When you are not so focused on it, you'll get up one morning in a rush and realize that the pants/skirt you just put on are a bit big. That is what always works for me.
I'm following this plan for now...make healthy food choices avoiding processed foods as much as possible and be as active as I can. Sometimes not thinking about it so much is what jump starts you to lose again.