Hey just a name, I could have written your post! (In fact, I've written some very similar, feel free to snout cos I got given lots of great advice). I've very very recently started to open up a leetle teeny bit about csa, which I hadn't really remembered until I started therapy a year ago.
Long story, I won't bore you with it now...
i also worry about panic attacks in session, crying uncontrollably, not being ale to keep it together....ugh. I think I'm going to take advice from peeps on here and ask for. Longer session, almost plan the disclosure with t. That way, I have time to panic, cry, whatever, and hopefully that in itself will be calming. Can you not go outside for a smoke mid session if needed? If you discuss with t first?
Also, I've written poems about stuff out of session, then given them to t to read. I even read on out myself last session, it was very very difficult but I felt proud if me afterwards! It certainly helps for me to write things down rather than say them, it keeps the panic under control better, I often scribble things and hand t a little scrap of paper....she reads it, nods, then folds it up very carefully and puts it in her pocket