Long distance relationship and depression

I was diagnosed with major depressive disorder since I've had severe depression for ten years and I'm only 22. I'm in an LDR and we only have only seen each other three times in the past year, and once was for just an hour. We live about 500 miles apart and not having him with me kills me. It literally tears me apart from the inside out. I get so depressed that I have self harmed myself (but not often). I love him with my whole heart and I won't ever leave him, but I need something to help me get through the day, every day. I just cry all the time and my therapists and every one else don't know what to do. I have no one to talk to about it and I feel like I bug the few friends I do have with my sadness all the time. I try to stay positive but I simply can't. The depression is truly taking over me and I can't stop it. I've talked to him about it and we want to move in together soon but everything seems to be against us. I mean freaking EVERYTHING. I am so fed up with the suffering I go through each day. I can't handle this anymore.....