I always carry ZAPIZ 0.25 with me, If I already know that I will have to come across the people/public which might create anxiety for me, I used to take 1 tablet half an hour prior to avoid panic...
Two or more really, really deep breaths each followed by going "floppy" with your whole body. At any time, you can practice progressive relaxation, and as you start, say "Stop!", or any key word that...