I've got an intolerance to beer, have had three one night, not been drunk, drink water anyway, but been horribly sick the next morning. I rarely have any these days and when I do I just have the odd one pint.
If I'm drinking while gaming I tend to drink wine, when I'm out it's either wine or spiced rum + coke (or just coke if I'm driving). I can take quite a few drinks before I don't know what I'm doing and haven't been in that state for years.
Alcohol affects different people in different ways, but maybe try spirits or wine instead of beer and see how it affects you.