Have you mentioned your concerns to your MD? some medicines can cause fatigue or muscle problems. A pharmacist might be able to advise you if you are taking anything that could possibly affect your athletic performance. But other than that, I am so impressed! You must be one determined TE'er! bottom line, take good care of yourself! Does your cardiologist know what you do in your spare time? I have a friend who is a former cat 2 racer, young ,healthy and vibrant. but she has atrial fibriillation which kicks in whenever her heart rate goes above 140. Drugs and an electrical "ablation" procedure to eliminate the A Fib have been unsuccessful. So her racing days are over, and she has to climb slowly to stay out of A fib, which really drops your heart's ability to pump blood. She has learned to pick her rides and riding partners so that everyone is still having fun. You rock just for getting out there to do your very best - now you have to find out how to let it be joyful and fun, not frustrating! Tokie