Sorry to hear that your appointment didn't go as well as you had hoped .... but at least you're able to realize it. Everyone one has "off" sessions with their T where things just don't seem to click, or where your head just draws a blank the whole time - trust me i know. Just focus on what you can do in your next session to make things go smoother. Make a list of things your want to talk about if that helps you ... or talk to your T about how you felt about this session, that way if it seems like its going to happen again, your T will be more aware of it and can maybe help the situation.
Let us know how it goes on friday ....
Jacq