Every time I drink, usually between 2-4 drinks and I start to get diarrhea that I used to not get before. I do not drink often, but I am usually up late with my friends and we are just hanging out and I am going to the bathroom pretty frequently. I do not think that I drink a lot but could this be IBS or could it be a form of alcohol intolerance? I have had these symptoms and some nausea and stomach irritability just the last 4-5 I have had drinks and none of those times did I have too much to drink. All of this makes it really uncomfortable to sleep that night and most times I get little to no sleep and if I do it is only a few hours here and there.