OP, I feel your situation so much. I've had occasional mild anxiety, easy to managed but the last few days it's hit me like a tornado.
I've tried breathing, in for slow count of 7 out for 11.
Made some easy, plain, fairly nutricous meals that I like: porridge with chocolate chips and peanut butter, jacket potato and cheese, yoghurt.
Bath because putting your head in water can lower your blood pressure
I went for a walk, had to sit down on a bench with my hood up while I had a little cry but it was nice to get out
Did nonnogram/match 3 game on my phone, it's absorbing enough to distract me but no danger that it will be triggering
Like pp I tried to do a bit of washing up, didn't get it all done but at least I've made a start and feel better than if I'd have just done nothing
I've been drinking tea but I'm going to switch to hot chocolate as pp suggested
Good luck getting through today 