Could you tell your T, "There's something I need to talk about, but I can't get the words out. Can you just talk me through until I get to it?" Kind of like 20 questions?

I've also e-mailed my T saying, "There is something I have been putting off saying because it feels too hard, but by telling you I'm going to say it I'm trying to commit myself to it." That way he reminds me the next time that I said I would talk about it. Sometimes you need to take baby steps... start by talking about talking about it.