^^^^^
I think you touched on something there when you mentioned the quality of what you are drinking. I went to Prague last year and drank a whole world of beers, the thing is over there beer is made of all natural ingredients, and not full of chemicals like it is here in the uk.
Anyway my point is over there i drank as much, if not more than i do here and woke up with minor hangovers that lasted until after breakfast, wheras here im fucked for the whole day and cannot concentrate on anything.