Something my T does when I'm really struggling is to ask me to just tell her "one true thing" and then if that's all I can say, that's it. If I can talk more, she encourages me to stay on the subject for just 5 minutes, then the next session, just 10 minutes, etc. We work up to it...starting with just a single statement. Sometimes, that statement is "I'm terrified to talk about this."