I've felt the need to flee from a session before, mostly due to anxiety. But, that same anxiety, plus my own stubbornness keeps me firmly planted in the chair. Not too long ago, I was completely overwhelmed. It was the end of a session, and I stood up and told T that I needed to leave right then. We both recognized the suddenness of that urge, and the extremeness of it. T suggested we walk to the kitchen first so I could get a cup of water. She was basically giving me what I needed, to get out of her office, but not letting me run out in a panic. It was a good middle ground and worked well for me.