Maybe it's not depression but you sound depressed. I had a serious relationship end once and I was depressed too. The cure is time. While you're waiting for time to pass, get busy. It will take your mind off your problem - maybe only for brief moments, but it's better than nothing. When I was depressed, volleyball took my mind off it. Bicycling would be a great distraction too, especially if you ride with other people and talk to them. Plus, endorphins are good for whatever ails you.