After a night of heavy party/drinking I get no hangover from scotch but a killer one from beer, why?

Answer 1

are you mixing them at all?

Carbonation causes the pyloric valve to relax and open allowing more alcohol into the large intestines at once, where the majority is absorbed

I also think beer has a higher sugar level than aged scotch.

sugar can quicken dehydration which can lead to a hangover
sulfates do as well, but that's mostly in wine I believe

http://www.realbeer.com/edu/health/hangovers.php

oh, and how much of each do you drink?
1 ounce of liquor is usually = 12 ounces of beer

Answer 2

My sister has a beer allergy. Something in the grains, hops whatever, I don't know, but whenever she drinks beer ( even a little now that she's older) she is sick the next day.

Answer 3

You are not supposed to drink the entire keg.