It's amazing how tasty, nutritous, low-guilt food can make one feel better.
And then instead of allowing myself to slide back into depression, I started reading Brin's The Transparent Society. Certainly a more useful way to spend my time than feeling sorry for myself.
I still don't feel like I have much control over being able to start a relationship with someone I find interesting, even though I probably could start one with someone I'm not interested in if I wanted to. However I think I can gain small bits of control over feeling bad because I find relationships hard.