I'm sorry, I've never felt that anxiety--it sounds horrible. Seems like your reason is with you, just, as you said, overwhelmed by the anxiety. Most of my tricks for feeling better deal with rationalization, so they are out. Won't work for you right now. You might try just breathing in and out, listening to your breathing, trying not to think of anything, but just listen to your breathing. You can do that. Just breathe in and out. That may relax you and help you feel better.

Or you could go in a chat group and talk to some people online. or go to the arcade and occupy yourself with some mindless games to pass the time while you are anxious.

My best to you--remember, we're here and pulling for you to get through your dark night.