tree, first of all:

I'm sorry you are so sad and feeling so horrible. I wish you didn't have to feel that way. Remember, feelings don't last forever. You won't always feel this way, I promise. I PROMISE.

I have experienced the same type of feelings after leaving a session where I made what felt like a big disclosure. That feeling of "why did I do that? If only I could take it back, I don't want to have said it, I don't want T to have heard it...". But try to trust that this came out today because it was the right time for it to come out.

I think you are doing great with taking care of yourself and attending to the 8-year old Tree. Self-soothing is in order after a huge session like that. Just keep doing what feels good, keep breathing, keep trusting yourself and your T and the process. You won't feel like this forever.