I'm not sure you're getting enough calories. You should be doing protein drinks and that would be more than 100 calories. Check, but you should also be able to have milk. Tomato soup helped me get some energy back too (Trader Joe's has a fab T. soup in a carton). Right now its about healing not calories. Lack of calories and protein could be making you more exhausted too. The bike might be a bit much, ask your doctor. I wasn't allowed to do anything but walk and that really helped to move the gas out. Hang in there!