I used to do the same as rainbow. Actually, I still do...I bring my jourmal to every session, and if I get stuck, I'll read out of it. For me, writing is so much easier than talking.

Also, once when I was totally stuck, I told my T "maybe I should just go home, you have better things to do than sit here in silence with me." She replied "I don't mind the silence. If that's what you need, then we can sit here in silence. It's your hour, use it as you need to." So, we sat in silence a bit longer, and then I told her I wanted to talk but was stuck and asked her if she could prompt me...she gently did so, and got me talking again. If there's something important that I need to talk about but know I won't be able to, I email T ahead of session and tell her briefly what I want to talk about and ask her to prompt me in session.

I've learned that not every session has to be all about talking. Sometimes, it's about just being present. Sometimes it's about having support to do things that are difficult (my T once sat with me while I made a difficult phone call during session because I needed the support). Sometimes it's just about having a place where you feel safe.