Thanks so much for your sweet and supportive replies! I've gotten most of my appetite back after the initial first two days, and I'm eating much better (still on program). I'm also working out which is definitely helping to elevate my mood.
The breakup was actually solely initiated by me, and I've since asked my b/f if we could get back together because I think I made a mistake. He told me that he still loves me a lot, but he needs a week to think about whether we can still be together because I said so many hurtful things to him when we broke up that he's now doubting whether I still want to be with him.
Anyway, I just thought I'd update. It's going to be a hard week because we live in the same dorm, but we're trying to avoid each other until he makes his decision. Thanks again for the support. If anyone has been in this situation or has any advice, I'd love to hear your input.