I have sessions like this, although I haven't had the long stretch that you describe. But I do sometimes feel shut down/frightened/needy/angry/unsafe/defensive/desperate.

I don't know if you are even able to talk to t about it, but here are some things that can break the cycle for me.

T telling me a story. Me thinking about what color I feel and saying the color out loud. Holding a stuffed animal. Coloring how I feel (usually just a scribbled bunch of colors). Doing grounding exercises (even when I don't feel a need to be grounded, I interpret this as t caring how I feel and I can hear ts voice sounding safe). Imagining sitting by t (I like to think about sitting on the floor and kind of leaning on t's legs while he sits in his chair).

Also sometimes it helps me to say a single word, such as a feeling. I tell myself that its not going to get any easier. sometimes just saying that I feel like fighting is helpful.

Or perhaps try writing things down when you are not in session and then handing it to him. I have often shared journal stuff that I don't think I can say out loud. He reads my journal out loud so I can see his responses, and sometimes he responds while reading.