Well this is just wrong… your system is already flushed out, hence why you piss every 10 min and its clear when you drink like crazy. When you piss clear you already flushed out all the nutrients from the body.
Conogers are added to beer and alcohol to give them color and flavor… that enzyme is what causes hangover headaches.
Beer is absorbed slower then mixed drinks to the vodka hits the blood quicker.
The farther back your head hurts the more serious the headache… thats when people die from drinking when the alcohol gets all the way to the back of the skull, numbing sub-consious functions.
EDIT: Best remedy for a hangover… sugar filled liquids (you have low blood sugar the day after)…sooo sports drinks and orange juice work best.