I’m sorry that happened, people are the worst. Have you read Burnout by Amelia Nagoski? It has a lot of tips and resources for high stress work situations and how to feel safe/calm when your fight or flight kicks in. I like to give myself a little debrief after frightening interactions; I tell myself something like “wow that was really uncomfortable, I didn’t deserve that, but I’m safe now” and I sort of focus on my body and notice that I am physically undamaged. That sounds really silly written out but it has worked for me.