One great way to fix and feel better is to get out in the sun on a beach or somewhere open and absorb a lot of vitamin D.
This is obviously not medical advice, but if I were you and if the mood swings were not too strong (agonizing) then I'd see the sun at least 20 minutes every day. That, and a lot more focus on the work that I want to do from now, a life that I want to lead from here on.