Reading your post is like a mirrored version of my life! I had this so bad I quit working. However that led me to start education again. I managed to get over the worst of the anxiety before but still struggle. I came across this post as I'm starting University in two weeks which is worrying me because of the toilet anxiety. I think a lot of it can be due to worrying about the new unknown environment, I have to know exactly where the nearest toilet is to me at all times so I find myself turning down parties, nights out etc as I'm afraid of an accident (even though it's never happened).
If you'd want, we can message each other through email about this, which could really help.