I have the same problem you have with the sort-of depressive state that keeps coming back. I've switched anti-depressants with some success, but I'm wondering if decreasing my mood stabilizer is an answer. Of course, doing that scares me because I don't want a mania.

Switching anti-depressant helped. Starting Geodon helped. Of course, if I had a regular schedule or didn't touch my computer before getting showered and dressed I might do more. Who knows?