Flying is a trigger for me as well. Based on some of my experiences, I think it might be common. There was the time the lady in front of me spilled her Bloody Mary on my beautiful purse. Then there was the guy who fell asleep next to me with a beer can in his hand, which spilled on my pants. They were oblivious to how ridiculous they looked and how mad I was. Maybe thinking about preserving your dignity and pride feeling for not being one of those drunk guys on the plane.
Of course, who am I to talk. One time I had to really use the restroom after drinking before and during a flight. We were about to land and had to circle around a thousand times and couldn't get up. I was so close to peeing my pants.
Good times.