How very shitty for you, Fabster. So sorry you've had so much to deal with - well done on your therapy; keep it up!
I did have with out with my parents - my father ages ago; Mum a year or so back. I suppose I feel better for having done it, but the truth is it doesn't change anything. I feel we're driven to do this because of that crippling, lingering hope they'll turn around and say "Oh, yes, I see it all now! I was totally crap & never treated you as the wonderful creature you are & always have been! How can I ever make it up to you?"
Which will happen when the sky turns lime green & fills with flying pigs
I do support efforts to have The Conversation, if only because you then know you did it. It sounds a little early for you right now, though. You may very well decide, later in your process, you simply can't be arsed.
What I have needed to do, at length, is to tell as many people as possible about it. I'm grateful to Stately Homes, a few other forums and several therapists for this. It's got a lot to do with validation. After a lifetime of being told we've got it all wrong, it wasn't that bad, we should just get over it, we're lying, we're too sensitive, yawn, yawn, yawn ... it's crucial to be heard.
I've written miles of journals & the same again of forum posts, have bent the ears of a dozen therapists, cried in recovery groups, and am still reading on it. I'm not "cooked" yet, either, but - in replying to you - have just realised my need to talk it through is much reduced. Hurrah!
So, yeah, give yourself plenty of time and space. Learn to not-care what other people think about you & your process. Tell your mother your thoughts if you like; what you want to do, for yourself, is all that counts here. Stay steady, love yourself, and have a bagful of good wishes from me