Must stop drinking

I have now had two completely blotto weekends in a row. It's very bad and I must stop it. Don't get me wrong, I have had a most fantastic time, at the time, but the headache, feeling sick and general alcoholic poisoning that follows just can't be good for me. So what I need to do is work out how to have the same sort of fun time, with half or less the amount of alcohol. Any ideas would be most appreciated!