What you describe sounds a lot like PTSD or CPTSD. I still have this now, though the most acute symptoms like panic attacks and nightmares are rare.
Realising that a family who had the role of caring for me was a demonic fraud that actually got sadistic pleasure out of watching me suffer felt like a shock as soon as I woke up to it. Not a normal shock that is an unexpected surprise, but a shock that leaves my nervous system completely shot and results in a permanent distrust of others and feelings of alienation from the human species.
I used to have a lot of nightmares about my family and school bullies, up until I was in my mid-20s. They did eventually pass for the most part. If I'd been properly diagnosed earlier and sought support, progress might have been quicker. But psychologists had been employed in covering up the abuse ("identified patient"), so it took me many years to ever try again.
Lastly, it sounds like you need to 100% cut off from the abuser in every way. If they are of the 'empathy-deprived' variety, I can promise you that they will not stop the torment until you are dead. And even then, they'll turn your funeral into a spectacle and make it all about themselves. Your attention needs to turn to self-care now. If parents were involved in your abuse, you might find some support at places like
Reddit. Hope you can sleep better tonight, knowing you're not alone.
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