I've been there. When I can't talk about something because of shame it has been helpful to say I can't or don't want to talk about some thing(s).

Usually T will ask why I don't want to talk about whatever it is that's on my mind. Then we can talk about the shame. And, surprise we're doing good therapy work without even talking about the taboo subject!

When we've done enough good therapy work around the shame I'm ready to talk about whatever it was that seemed so shameful as to necessitate silence.

Sometimes this all happens in one session: Can't talk, too much shame--talk about shame--actually talk about subject about which I'm feeling shame

And, sometimes it takes months, years, decades? (I haven't gotten to decades of T yet, but am getting close. I'll let you know when I find out just how long it takes. )

~doubtful