He has a totally separate personality

It took me a long time to learn this. It’s like a Jekyll and Hyde situation. They’re like two totally separate people who aren’t aware of each other. His voice changes, his accent changes, he uses words and phrases he never uses sober. And he does the most appalling things to me. He recalls false memories, like I told him I worked as a stripper or had multiple abortions.

I don’t know why I’m looking for other than some support from anyone else who has experienced this? I don’t have anyone I can talk to.