Fill up my sense

Having established a few vulnerabilities, having established that I have cut down most of the situations that trigger my social anxiety and therefore potentially a sense of panic, having established that my protected life is basically to be surrounded by the two most major triggers of all, how does one go about telling them: hem, please, stop talking , yo are triggering me, I can feel it? Every word increments the pain in my chest and I feel it so I fight it and try to breath but as yet don’t have the appropriate techniques so how does one tell him please just shut up without starting a fight that will make everything worse?
Ah well, can’t be helped, looking forward to four hours in the car with this battle.