Claustrophobia
I have very intense claustrophobia. So now I'm going to tell a dnd-esque opening to show you what it's like.
You walk into the room, and open your eyes. Immediately, your chest tightens up, and it is hard to breathe. You look at the room, and it seems to get smaller and smaller the longer you spend in the room. You sit down, and take up as little space as possible, but the ceiling just seems to crush you more and more. Nobody else is affected, but you feel like if you are in this place any longer, you might be crushed to death. You smell something off, and your throat hurts. You have thrown up all over yourself.
This is a little bit of what it's like, and I'm sure a lot of this is also Anxiety taking hold of me. So no, to answer a question y'all never asked, Anxiety is not fun, and neither is having a phobia.