i tend to use fidget toys to give me some sensory input on my skin. and then try to get into a quiet spot on my own asap! breathing exercises have helped a lot too. and if im still in a head space where i think rationally, i start describing my surroundings. like three things i can see. two things i can hear, one thing i can smell. its distraction of my brain that sometimes works, or at least buys me enough time to get into "savety". after i spend some alone time i sometimes even reenter the social situation. tbf that mostly happends in my own apartment where i feel save ^^