Granite,
Working through my inability to speak was, awful. Sorry but I am so glad I'm not in the... brain goes totally blank, frozen vocal cord, some one sitting on my chest, and if I even try to say that word I'm going to puke...stage anymore. ((((Hugs))))

I was very fortunately that my T, although she wanted me to talk about things, was able to help me by supporting other modes of communication. Writing, drawing, emailing, talking about things, letting me back out of topics when I need to.

All I can recommend is that you just try ANYTHING you can think of to communicate (any mode) at least one or two things about your experience to your T. I've done some wacky things to try to move myself forward. During one early session, I set my cell phone alarm to a crazy ring in the middle of my T session. Since my phone is usually on vibrate both my T and I about jump out of our skin when it broke the silence. When I open the phone the alarm message say, "stop f'ing around and tell her about x!" After laughing at the interruption I told my T what I had done. I don't think I actually told her about X that day but I did say something and certainly I communicated to my T that I was really struggling.

My point is in therapy, trying does count. If you have a good T she will meet you where you are and help you from there.