As Primavato mentioned, some people are probably more susceptible to mood disturbances than others. A pre-existing disorder can be amplified by consuming alcohol. I have ADHD, and alcohol will exasperate the symptoms 10 fold, particularly if I am drinking on a daily basis. I won't sleep for days after a binge. Alcohol is a drug. A socially acceptable one.
Give yourself a few days for your brain to adjust.