Hi.. take a warm bath, some chammomile tea, bach flower remedies work sometimes... I get that twisting feeling in my chest when things get really bad too... Ive had it for a couple of days this time around. I have a prescription for lexotanil which helps big time, maybe you could talk to your T about something similar. Lexotanil is super addictive though, so I'd reccomend having a long conversation about meds beforehand. For me its a sign of extreme tension, sometimes you need to do whatever works to calm things down a bit. It wont make everything better, but at least you can breathe.

Sometimes I sit in the shower and let the warm water just run over me and get completely lost in the warmth. No thoughts at all, its a very primal feeling, like being in the womb or something. That might help a little as well.