Problems With Crowded Areas?

i been noticing that i might be having problems with crowded areas. i ll be sitting there and then all of a sudden my heart rate will accelerate and my breathing will accelerate as well as if i m not getting enough air. this will continue for a minute or two and then go away. this has happened twice now. i hope this is nothing serious and i m just jumping to conclusions
https://www.myptsd.com/c/threads/problems-with-crowded-areas.56219/