Why are you in a hurry to get over it?
You're allowed emotions you know. Just because you weren't allowed to be angry at their treatment of you growing up, doesn't mean your anger isn't justified or that you're a bad person for feeling that way.
You get over it same way you get over other emotions - by feeling them, sitting with them, acknowledging them and working out where they came from and why. All of which your therapy will help with.
You had an entire childhood and adulthood of abuse, together with the bottled-up feelings surviving those relationships and in that environment necessitated. That's not something you get over in a week. Took me 15 years.
Though it would have been quicker had I gone NC as soon as I saw the toxicity for what it was, instead of thinking I just needed to get some boundaries (I did, as I had none at all, but with hindsight it obviously was never going to fix the issue of their behaviour). People who bring you up to have no boundaries and to tolerate abuse don't suddenly go oh ok then I'll behave when you start setting boundaries. They push back against them continuously, ramping up their abuse until one day you get sick of it enough and go NC as a last resort to save yourself and your remaining health/sanity.
I DGAF now, residual sadness for the parents I should have had is all that's left when I think about them, which is rarely. Minor annoyance felt when the manipulative games are attempted yet again. Which they do periodically, but only mildly, as they're aware I'm one new SIM card away from being entirely NC and that knowledge keeps them in check a bit. At this point contact is the exchange of banalities a few times a year by text.
Have you seen the Stately Homes thread? You can get long term support there too if you want. It's full of people with stories like yours.