Not sure if this is an option--I see you're in NY so probably not the best season for this--but a couple times when I was having a panic attack in session and wanted to go hide in the bathroom for a bit, my marriage counselor suggested us all walking outside in the courtyard. The fresh air and walking, so not staring at each other, was very helpful to me.

Otherwise, I tend to wear a bracelet and necklace that I can fidget with. Another thing is, sometimes I've realized when I'm really anxious, it's because I need to get the emotions out. So if I can let myself cry, that can help.

Ex-T also sometimes used to do grounding exercises with visualization for me, so maybe your T could do something like that?