I have had panic in theatres. Which is bonkers because I've been working in theatres since I was 14, behind stage, on stage and eventually running one. But very early in peri, before I even thought about menopause, I went to see a production in a big theatre and we were sitting in the middle of the row about half-way up the rake. Suddenly, before the show started, I was off. Fearing I would fall forward, faint, make a scene. It was a single act play too, no interval! From then on I started asking people if we could sit at the ends of rows so I could get out, but I would use the excuse of my long legs. I always carried a Rescue Remedy with me too and as someone else said, it worked. I think it works because we think it will work. There is nothing rational about such fears.
It's much better now I'm older. I will go to the ballet with friends and sit in the middle of rows high up in the balcony and be fine. But it was horrible while it lasted. I ended up not being able to go out unless my husband was there to hang onto.