Its ok also to have one of those sessions, she acknowledged your frustration and discomfort, silence speaks a thousand words, you were able to let those feelings flow in the room, she captured them, it was not a wasted session. You realized that maybe next session you will do better, so yo have hope, and are looking foward to next week. If it should happen again, its ok, you are sitting there with your feelings and your t is attuned with them.