We sat on the couches and watched comedy clips and American political speeches on youtube, and then went out for a couple of pints when we ran out of beer.
My head is really pounding. The brain is 70% water, so when you are dehydrated it shrinks, and gives you a headache.
My body is shaking. Alcohol relaxes the arteries, lowering your blood pressure, and giving you the shakes.
Alcohol also has a neurological affect, which leads to potentially strong feelings of paranoia while hung over.