Just my twopenny worth:

I found I feel this way when I'm scared of the T, hiding something from them, which is usually out of fear. I can't say what's really on my mind, so I rebell talking at all and feel blah. The other day I said something, and T responded with a real harsh "how do you mean?" It was some major thing, so Ts response is valid, she wanted to be clear on this, making sure she heard me right. But I heard it as "don't you dare saying this again or else", and totally closed up, feeling punished and rejected. And didn't realize it at all, just been through two "blah" sessions.

Hope this helps...