I think part of why we have to slam the door as kids IMO is because abandonment/neglect is life threatening. We can't afford to face that, instinctively we know we must close the door to survive because we are on our own, no-one is there for us.
Talking is good!

To construct a frame, a narrative, around something in order to be able to make sense of it, even if for only brief periods at first, is wonderful. That is the complete opposite to what I was taught - which is to ignore it and it'll go away. (Or, "it doesn't exist, there's no problem and ergo you don't really exist to me", which is crushing to a child).
We now know that it doesn't go away. Like a monster in a horror movie where the monster disappears only after it was acknowledged and allowed to exist, there is something there that one day I'll have to accommodate. Titration (thanks, I had no idea of this concept) sounds like an entirely sensible approach, as attempting to process the entire bundle at once will inevitibly lead to flashbacks, disocciation etc., all things that are common in my past.
I hope I'll be able to carry these lucid thoughts with me. This past week or two has felt brutal at times. Right this moment, having eaten and taken a nap, I feel comfortable enough to feel a small measure of optimism, which is unusual and I hope, something that might happen more frequently.