I found some simple breathing exercises helped me to stop it momentarily. It will pass, but I know that's not going to make you feel much better right now. I remember feeling like it could actually kill me. Stone dead. Right there and then.
My favourite breathing exercise (which I still use to get myself grounded if I get in a momentary tizz about anything) is to put thumb on one nostril, 1st and 2nd fingers lightly on centre of forehead at top of nose, and finger on other nostril. Now, push down lightly to close one nostril and breath in the other on e slowly. Then chaange which nostril is covered and breathe out of the other nostril. Now breathe in through that nostril and out of the first one. Repeat about 8 times.
A little meditation I liked was to simply focus on each of my senses in turn. So, first close your eyes and focus on what you can hear, then what you can smell, then how different parts of your body feel.
Hope it passes soon.
BB