I think you are doing a great job of writing down what you do remember when it does come up. There may be some things you will never remember, and that can be so hard.
I don't have the problem with the memory but I do have issues with "body memories".
When I get triggered, I feel in my body what I felt when I was a child but I don't have a specific memory. For example, I might freeze in session if I think my T is upset with me because that is what I did around my father. I really like the fact that you take the time to journal about your sessions and hope it brings you some comfort.
Thanks so much for posting!