I think trying to get a balance in life helps a lot. I've read a homesteading book that spoke of such balance; 4 hours bread labour, 4 hours in the garden, 4 hours fun. Was it the Deerings? @Morgan101 do you know it?
I think the things you are doing will help. I don't think I have ever heard of Deerings, so sorry, I can't help you there.
SAM-e may help, but can be dangeous for people with manic depression or bipolar disorder. I would stay away from it. It is sold as a dietary supplement and the FDA does not study dietary supplements.
The only thing I have seen suggested that has not been mentioned is Kava.
Kava is a root from the kava plant that’s known for its sedative and anesthetic properties. It’s most commonly used as an ingredient in relaxing teas. Areas of the South Pacific, including Hawaii, have used kava for stress release, mood elevation, and other calming effects.