I think your mindset has a lot to do with what kind of buzz you get. You can get physically drunk and feel either up or down with it depending on what's going on in your head. If you are trying to quit drinking you are probably telling yourself you shouldn't be drinking, so you kinda bring your own buzz down. I know it's disappointing when drinking isn't as much fun as it used to be. Maybe it's a sign that you can live without it?