Will it ever stop?

I’ve never had anxiety before and this started a few months ago. I get overwhelming anxiety when I’m in public crowded spaces and feel trapped or unable to get to a bathroom or place I can be alone. I get extremely nauseous, dry mouth, heart racing. I want this to go away it is starting to affect me at school and how I do in my tests because I get so anxious. Idk what to do and I just want it to go away