Alcohol also makes you lose a lot of moist/water. That's why you feel thursty after drinking alcohol. But it's not only the shortage of fluid in your body... also around your brain. That's why you get a headache and/or a "heavy" head. It's very bad on your brain. Trying to get rit of the alcohol your body creates acetaldehyde. But that's very toxic. And that's why you feel sick after drinking alcohol.
