I have very limited medical knowledge in general but I know exactly what you are feeling. I used to play 5 or 6 hours of soccer every day in the summers and now I do nothing, I used to play hours of chess which I cannot do anymore, this all makes me feel depressed and anxious like you. What's worse is the doctors tell me I am simply a hypochondriac (spelling sorry), and there is nothing wrong with me. This makes me so mad I can't describe it, im very sorry for what you are going through, and I assure you things will improve.