sure do and I feel for you. Does this feel like a constant flurry of attacks or just one building up. If it's just one, getting up and getting some fresh air might help. I also try telling myself what's the worst thing that could happen and would that be a big deal (my panic/anxiety usually builds over the feeling of not being in control of a situation, my "do I really care/what's the worst thing that can happen response" can sometimes defuse this.) If you can stand the taste of mint, I find that strong mints can snap me out of it, but that's me.
If it's a flurry of anxiety and it's been going on for several hours, you may need to figure out what the source is and either take a serious time-out (down time) in a safe space for you or if you have meds for this take them to cut yourself a break.
sorry you're feeling this way, it's a sucky feeling I know.