Thanks, everyone.
When I have a good session like that, it "lasts" a long time.

My next session will be 9 days after the one I described here. I am on day 5 and still going strong.
I had a little bit of a triumph a couple of days ago. I'm trying to be better about setting boundaries and I set one for my H and he followed it! It was like a miracle. This never happened during our marriage and the same pattern has been continuing now that we are apart, even though I have been trying to voice boundaries more clearly. (Now that we are getting divorced, I figure what have I got to lose?) Anyway, something must have clicked for him and the result was good. So maybe this is a little of what T means by the relationship becoming more two way, although I still am not ready to say the things to H that T suggested.
The best part for me in the session was sharing that painful memory. I feel lighter now that it has been shared.