For me what I feel depends on the trigger.

Some just make me feel uncomfortable. Like being in crowds the whole time Im in a crowded store or on a crowded bus I feel closed in and want nothing moe than to get out of there.

Other triggers I get more panicy where I cant breath, heart races and so on.

other things make me want to go into my tunnel area where I feel floaty and far away in a way it kind of feels like when I have taken benedryl and Im in that zoney Im almost asleep but floting and watching from a distance.

Then there are other triggers where I don't stop and float in my tunnel area I go completely into my la la land (mental safe place) where the only thing I see, hear and so on is the music in la la land, the sky and clouds, grass and tree of la la land, and sometime I look around for the musics starting point and theres my favorite singers.