While I was not SA, I can say that I had a very similar experience when I first opened up about incidents of physical abuse. Talking about it uncovered a lot of the shame and fear and anger that had been buried in me. I would feel totally raw afterwards, so I did a lot of what you've suggested to your T--a week or two of heavy stuff, a week or two of lighter stuff. Trust your instincts on the appropriate pace for YOU.

You're brave to have discussed this with your T! You are making good progress.