That is frustrating. I also had trouble opening up during sessions/going blank during sessions, but would feel lots of things afterwards. So now, when I'm feeling those things I email them to her and then she emails a brief response and we talk about the rest during the next session. It makes me feel like I'm pushing myself and being open, even if I can't yet do that when I'm actually there, and it helps her see what's going on with me, even when I can't talk about it directly with her. Maybe you could try writing/emailing your thoughts after session, and then discuss it next time? Good luck!