I can't really add anything that hasn't already been said, but I did want to chime in and say that I agree with those who say that your therapist needs to put the breakers on. In dealing with trauma, things need to move slow. I've been with my therapist for two years (I've seen other therapists in the past, but am only now really focusing on my PTSD), and we're only now starting to VERY slowly delve into my history. We have had to spend A LOT of time just focusing on safety, first. And even when I do share some details, my therapist always paces things and stops me to help me get grounded and pay attention to how I am feeling before I get overwhelmed during the session. Then, before leaving, my therapist always ends with a soothing exercise of some sort and asks me what I plan to do to take care of me, and if I have trouble coming up with things, we brainstorm.
DURING the session I usually will bring my dog (you could bring anything that you find soothing), and after we go for a walk and I really focus on my surroundings and my feet on the ground. When I'm home, in my safe space, I just practice self-care, which for me includes creative things, like drawing or playing music. If I need to, I also reach back out to my therapist via telephone. We have a "safety plan" in place, he and I.
You should never feel pushed to talk about things in therapy. Ever!