Originally Posted by shanaku
I get a head ache if I don't rest. I give it two or three pulls, purge the hookah and let it camp for a little bit. Also don't write off the many people who suggest staying hydrated.
It is very important.
QFT, always try to have something to snack on and drink (or combine the two.. smoothie!) but yeah.. Headaches are usually the result of oversmoking, ie lack of oxygen, or not having something on your stomach.