Hey tofuturkey!! Im not a doctor, but I think it may be the fact that your NOT eating the 4-5 meals a day. Your supposed to eat every 3 to 4 hrs (or 2 to 3 I forgot which one) even if your not hungry. The reason for this is so that your metabolism doesnt drop too low, and your body wont go into starvation mode. You may not be giving your body enough energy to run and stay up. Eat a few more calories, and a little more often and you should feel fine. Those 9 days are very difficult, and you have to make sure youre eating enough calories ESPECIALLY if your exercising. Calories in, calories out is true, but your body also needs some of those calories to run efficiently. I always feel like a banana gives me a little extra energy, I always have one before I work out. Theyre a little high in calories, but SOOO good for you. Dont give up just yet. Make a few adjustments, and hang in there!!!!! It will be worth it!!!!