Hey Anna...we all get depressed at some point, it just sucks cuz your's has to be over a long distance relationship. I don't know your situation, but the 2 of you can make it work if you want it to. Both parties have to want to make it work and be willing to make some sacrifices in order to do so. You seem like a strong chick and I think that you're more than able to handle this!
keep your head up and everything will work out how it's supposed to.