That is truly awful, and I'm sorry you had to go through that. Chitchat about patients, especially when rude, is very unprofessional.
Aside from that, though, you said you've been to that particular hospital 100+ times? Is that correct? And I'm assuming you mean that you've been to the ER that many times? While you should always get treated with respect as a patient, and the nurses had no right to do what they did, there is also a line that has to be drawn when you've been to the ER 100+ times (and I'm assuming nothing serious has been found), and you even know it's mostly to do with untreated anxiety. Emergency rooms are for emergencies. Yes, you have a mental illness, and I get that -- I have one, too. I've done the constant emergency trips and the annoyed doctors, and back then I thought they were just rude and awful, but now I've come to realize that I was the one out of place, not them. Obviously it's never okay to say the things they did, but this is just some food for thought in general.
Really, though, please look into getting help for your anxiety. Hospitals are not the place.