I know it's hard... I've experienced similar, though not as severe, situations.
Here is something that helps me but I really have to concentrate and you may to...
Try laying down (I lay on my back), closing your eyes, and just concentrating on your breathing. I mean really listening to each breath in and out. (I count to 10 breathing in and 10 exhaling)
Your body is going to do what it is going to do (I've had mine throw me on the floor) but the more you concentrate on your breathing you will be surprised how your body and mind will relax. It may take time.... It does me when my anxiety and body are in full panic and pain revolution!!!
You can try soft music in the background but I don't recommend anything with a bunch of words or the television.

Abbie
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