Have you tried changing your nutrition? Some argue that it all starts in the gut. First, drop sugar. If you're going to go this route, consider trying ketosis for a month. You have nothing to lose (except the need for meds and some body fat :-)

Omega-3's are supposed to help. I've read that 1,000mg unopposed EPA (that means EPA-DHA). There are also other vitamins and minerals that can help.

Get outside! Get some sunlight. Take a walk. The light will help both through your eyes and your skin.

Get more exercise than just your walk if you can. Get dopamine pumping naturally.

Start there. See if it helps. Good luck!