I am a voracious beer man. I drink beer almost everyday (often wheat beer over lager). Lately I have been feeling that the day after, I consume beer, goes with the issues like upset stomach, stress, tiredness sort of things. I never do scotch or any other hard drink but wine, that too seldom. I am almost 27 years old guy and weigh 62 kgs. I do not know but capacity has also gone down with the years. Is there anything which I should be bothered about. And kindly enlighten about the beer unit. Is 1 unit= 1pint or 1 can or 1 bottle.