I understand melancholy. I have been pushing hard through the fog to reclaim myself. I worry about kidney health and blood pressure. It seems to me that the stronger I get physically, the more mental strength I gain. Someone suggested that I challenge my self by adding one new activity every day--simple things like sweeping the floor, getting the mail, cooking. Now I can walk 2 miles carrying 5lbs in each hand and not pant going up the hills. It is tedious, rebuilding what you had only weeks or months ago, but for my mental state it is necessary. It is great that you are optimistic, that takes you far. Best wishes.