I have a defect, a serius defect.

I am a moody person. I don't think I'm as outwardly moody and irritable as some people I know, but I suppose there must be some of that. It's just that every two or three weeks, I become internally "dark" for a few days (or a week at the worst).
At these times, it feels like I have an overwhelming number of things that I need to do that I don't have the time and energy to take on. Certainly, that's true since I have a tremendous number of projects I make to take on at work, at home, and personally. However, while that's always true, it's only in these "moody" periods that I feel especially overwhelmed and depressed about it. Of course, feeling like that doesn't make me feel like actually doing anything... so, it's very pointless and self-defeating.
This weekend I've been feeling sick. On top of the sickness, I can feel the moody depression coming on today ( and tomorrow .. ). I should be relaxing and looking forward to taking on any of the interesting projects I can get to this coming week... appreciating what's in front of me and not worrying about the rest. However, I can think those things on an intellectual level, but I don't feel that way on an emotional level. I suspect there's some body-chemistry component to it.
I'll keep working on it from the intellectual angle. Maybe I can just let myself be moody and not think about it so much. I wonder what that would feel like.