A diagnosis is a good thing, so you know what you're dealing with. Your body is telling you to take care of yourself, and rather strongly. Heed it's message. Be gentle, take time off, heal yourself. The body has remarkable healing abilities. Read books that are uplifting, about people who have overcome great odds or illnesses. Have you tried writing your feelings down in a journal? That can be healing, too. Someone wrote, (I think is was Richard Bach in his book "Illusions") that we are never given a problem without also being given the ability to overcome it (or is it the solution? I don't remember). Anyway, you are stronger than you think. Good luck!