I have had that. There were a couple of things which helped me.
Firstly, I found a breathing technique which worked for me. It's called 7:11 breathing. You ensure you are breathing deeply from diaphragm (ie ensuring your belly moves too), breathe in to count of 7 and then breathe out to count of 11. The most important part is ensuring the out breath is longer than in breath as that engages our relaxation response. You can shorten the numbers if they are too long, to 3:5 for example. Keep it up for at least a few minutes
A trick with this is to try and practice when you're not feeling overly anxious too, as it then becomes easier to do it when you're really stressed. If you're a visual person can also find a rectangle in your environment and use it with the breathing - keeping a steady pace breathe in whilst scanning eyes along short edge, and breathe out scanning eyes along long edge
The other thing that works for me is colouring. The repetitive motion of colouring and something to concentrate on really helps, and have something to show for it at the end. Adult colouring books are very common now, can get in magazine or book form, and pretty much any topic you can think of too - whether you're fancying shapes like mandalas, nature, animals, people - all sorts. Amazon also has lots
Something else that helps me too is getting active - brisk walk around house/garden, do some step-ups on the bottom step of the stairs, even something like star jumps - just getting active and burning off that excess anxiety. Could even try dancing to some energetic music - anything to start getting yourself moving. May have looked stupid but I managed to avoid a panic attack yesterday by stomping around my lounge doing knee lifts (thankfully I was home alone!) Xx