I kept pushing fluids, gave him lots of homemade chicken soup, got him to get up and go for a short walk, and then a little later, he went out for a short, slow, easy run, about 15 minutes. I gave him some fruit, some magnesium, zinc, vitamin C, Sambucol every 3 hours or so (a homeopathic immune booster), and mucinex. I didn't give him any whey protein shakes because he didn't want milk (normally he loves them and has one almost every day.). He had to go to school today in order to compete, and I just sent him with a thermos of chicken soup, fruit, carrots, and popcorn for lunch.
Tinman, I am curious about the blood volume thing too. One day of inactivity can reduce your blood volume? Even if you are drinking lots of fluids?