I'm halfway through day three, too! I've been doing pretty good (no hunger, etc, plenty of energy) but the first day was HORRID. I had awful mood swings all day, and threw up that night (I think it was a combo of the 3rd day off caffine and the first day of birth control - which always makes me a little sick, but with food it never goes that far.)
But you should drink more! That will help the energy! Try putting less Cayanne in to start ... it's easier to down, the slowly add more until you are up to the full amount. Good luck.