I don't know what's wrong with me...

I was at my husband's tias house today for secret Santa. It was calm at first because everyone was either outside or in the dining room/kitchen. I was on the couch with my SO when everyone all came to the living room and it got really squished up and pact. It was a lot of people and they were loud while talking. I for some reason just felt frustrated and anxious and was about to cry my eyes got watery but I stopped myself. What can be the reason Ladies?