My T won't accept "I don't know" from me, unless she can tell I've really thought about it and honestly don't know. Even then, sometimes, she gently pushes me by asking questions or just waiting until I can provide some kind of answer. For the people pleaser in me, I tend to say it when I'm afraid of saying the "wrong" thing. I've gotten much better at expressing myself, but I fall back on "I don't know" when I'm overwhelmed. At my last session, I was having a rough time and said I couldn't concentrate/focus, so she asked if I wanted to walk around, get some water, do jumping jacks in the lobby (no one else was there), and I laughed and declined. Since I was having trouble talking, she helped ground me a bit. At my next session, I'm really going to try and say what I'm thinking and feeling without filtering it and giving up with "I don't know."