I never used to understand why people said alcohol is a depressant, but there are times when you feel really awesome, and others when the worlds crashing down around you... I'm not sure why all of a sudden; although alcohol does affect adults a lot more than children, studies have proven that, I'm exhausted tonight but I'll have a look for them tomorrow... I'd say its all down too your age probably, you've matured, so's your body and alcohol just affects you in a different way
. Also have you changes what your drinking? Do you drink alone? Socially?