I bring coffee with me, and we sit on the floor 90° to each other.

I find it really hard to open up in therapy as well, and spend a lot of time talking to the carpet. T pays really close attention to my body language and breathing to gauge how dissociated I am and to stay attuned, and it's hard for me to face that close scrutiny while talking about hard stuff. It works out.

My T let me bring one of my own throw blankets to leave there, if that would help you, maybe your T would let you bring something familiar?