I've always had anxiety but never this bad. I just bailed on what was supposed to be a fun day out with friends. 

I tried to wait it out but i physically couldn't. I tried slowing my breathing and controlling it, thinking rationally, that thing people do where they list the things they see. The worse part is as soon as I left the situation I began to feel better and I feel alot of regret that I didn't stay now. I basically never leave my home and I don't know how to even begin fixing this. What do you guys do in these situations?

It only gets worse from here.