It's something you can build slowly, and it tends to stick more that way.

Start by committing do doing your thing three times a week for five minutes at a time. Then five times a week. Then fifteen minutes at a time. Then an hour, and so on.

I get your point. But my opinion is that you will benefit more from a method to get things done, than from just waiting for your mood to improve. I rather not take drugs if I don't have a health condition.