Anger is a secondary emotion. It comes after an initial emotion, whether that be stress, anxiety, vulnerability, etc. U may just tired, restless, at a certain time of the "lady cycle". There could be many reasons. I think the best thing u could do would be to know that you are feeling this way, and then remove yourself... Go cuddle up with a pet in front of the TV, take a bubble bath, etc. take some time out for yourself and cool off a bit. Get a restful night sleep and hopefully you will be out of the funk tomorrow