Why not email your journal to him ahead of time, or parts of it, and tell him that's what you want to go over in your next session?

Not being able to talk in therapy is probably based in trust issues, anxiety about disappointing him, feeling unworthy of having emotions, feeling unworthy of expressing emotions, and feeling unworthy of getting sympathy for emotions. And in my case, I shut down to avoid feeling like I'm too close to someone and therefore need to cut all ties with them.

Feeling too close could be the big problem. If you feel like it's something more than a professional relationship, then you won't be able to make any progress. I had a therapist once who did that on purpose. In order to facilitate closeness, she told me waaay too much personal stuff about herself, and I completely shut down and couldn't talk to her. If your therapist has shared personal information, or if you have concocted (fantasized) information about their personal life, then it could be that it's too close to a "friendship" (even though it can never be a real one) and it's no longer effective therapy for you.