It's hard to cope when things come up outside of therapy. I don't know the "right" answer, but I always had to try to balance remaining a functioning human being with facing what terrified me. I settled, most of the time, for recognizing what was coming up and shoving it aside until I could see my T and deal with it.

Can you try writing it down and folding it up? Then it's there, ready for you to bring into T, whether you read it aloud or summarize it. Putting it away, so to speak, until later?

I have gone through the same problems at night and it is horrible. Take gentle care of yourself, if you can.