6 beers and you have a hangover?
id be concerned that it took 6 beers to give me a serious hangover. id start asking who slipped something in my drink.
first time or not 6 beers should not give you a hangover. not enough of the bad chemicals in them to cause a residual problem. id ask your friends if one of them slipped something in your drinks.
6 beers for FFS and your drunk
Drink a bottle of Bundaberg Rum and see how you feel