I'm sorry to hear you are having a rough time. I can't recommend what to do, but if it were me, I would try to avoid going to emerg. I'm not sure how they could help. (But I'm also the sort that avoids the ER unless physically dragged there!)

I'm thinking if you have a massage appointment that might help relax you and get your body back in balance.

You're not alone. I've been lucky that my anxiety has not been as intense as what you describe. I find that it helps me to sit in a dark room, be very still and breathe slowly and deeply. In fact, that's where I'm headed now.

Good luck.
Starr