The cupula, is a pesky little nerve located inside our heads. Its surounded by Blood. The thickness of our blood is what keeps this little tyrant stable.
So what happens to your blood when you drink too much?
It thins.
It thins and becomes watery. The lack of density allows the Cupula to move about a little more freely giving you the dizzy vertigo like sensation of being too damn drunk.
Next time you decide you want to drown this powerful little nerve, when he has you on the run, sit down and place both hands firmly on the table in front of you. This tricks the brain into thinking there is still a way to avoid the inevitable case of vomiting.