i would certainly say that the next morning there is often a paranoia - nothing specific, just a geneal feeling.
could be due to a feeling that you may have offended someone, but even when you know you haven't you still get the paranoia, so i do think its probably most likely to be the alcohol.
remember, everyone else was drunk too and probably won't even remember if you said something a little bit tactless, and also most people understand that people do things under the influence and so are not really offended