I'm sorry you're experiencing that as well, the worst thing is it lasts for days and affects so much. I've felt a lot better today but on Monday I was actually scared to go to sleep as I wasn't sure I'd wake up.
The only thing I can say is that it does pass on its own but its so difficult while it's happening
my fiancé said he'd never seen me struggle as much as I did Monday night I was fighting for every breath and the more I fought the worse it got
I've never had problems with anxiety until last November and it was so scary at the beginning. Now I know what it is but it's impossible to talk yourself out of it.