Zoo, while doing the narrative part of my therapy, I often was stuck like that. It was a part of the depth of the trauma. One way I found out to get me through those stuck parts was to use the whiteboard in the T's office and write words that I couldn't say. I would erase them just as fast but T would see them first. From those words he was able to help me after I sat back down and I could add more stuff to the words. Not easy at all. If your T doesn't have a whiteboard, maybe you could use paper and a crayon?