Write again and share those feelings. My T lets me write as much as needed, and I found out that it helps me process through things. Don't let shame get to you. My T says "We don't do shame"

There is a reason why you were triggered. There is a root to your pain that can be healed with therapy. And it sounds like your T is a good one to help you do that. You are doing GREAT by being brave and letting those roots come to the surface!