((Kiya))
I went through a very very very very long time of constant triggering in session. What worked for me were a few things: First, I knew I had to take everything very extremely slow. I realized that some sessions it was okay to just talk about light things because what was happening was all parts of me were getting to know T and trust him. Second, T had to be super super super consistent. No EMDR, no challenging me, no special things, just talk talk talk. This also helped all parts of me to learn to trust and feel safe in T's room. Finally, I had to begin to take risks like you did today, telling T when I didn't feel safe, and when I thought he was throwing me out, etc. In fact, I'm still working on some of that stuff.
Keep working, it really sounds like you are making progress.