I don't have any advice to give. However I second what Montanan has said. I may "piggyback ride" with you on this thread.

Depression can make you lose interest in the things that you were passionate with before. I feel like I'm going through that. I worked out for a number of years, but lately I have backed off from it. I was going to start today, but I came up with an excuse not to. So I'll try next time. Also I was passionate about bike riding, but lately I don't feel like doing that, too. I still keep it up, but I really push myself into doing it. I've done those things for many years and it feels old to me now.

That's pretty much what I have to say. Sorry that I don't have any advice.