I get severe headache sometimes after consuming alcohol. It is not the usual hangover, as sometimes the pain starts within an hour of drinking 1 or 2 beers. It stays for the whole day and even continues the next day after sleep. The pain is usually at whole area of the back of the head. At times the headache starts only the next day. I had hangovers before, but this is not the same. I believe it is called a cocktail hangover. And it doesnt happen every time i drink, only happens once in a while.