Strange. I never get sick from hookah smoking....
Hookah smoking is smooth cause of a lot of water.
You sure theres enough in it? I find if theres not enough water you get a head ache. If you are sharing a hookah among enough people, then you should fill it with water to the top. That way everyone sucking through their hose will cause a lot of bubbling and no water will get in through their hose. I find when smoking it alone, water will get in my mouth cause Im the only one smoking it so its gotta have much less water. If theres not enough water you gotta suck harder to get it to bubble and then you get a head ache for doing that and its really bitchy to do.