First of all, anybody normal who had that kind of stuff said to them would later suffer mental anguish. Those are extremely horrible things to say to someone and that was HIS choice to treat you in that shitty way. So you're a perfectly normal, feeling, thinking human being and you can throw my advice out the window - but I just wanted to say that ANYONE normal would have some kind of later reactions. In my opinion it could partly be your brain/mind/heart trying to make sense of it. And it may or may not be overall great to keep re-living it in your mind. That part I don't know because I'm still going through it too. I guess it's part of the healing process but it can be too much at times. That's where people have told me to try breaking that thought or "stuck" in a bad memory feeling (it may be flashbacks- I'm confused about the difference).
Some of the things that help me are to take a shower/bath/light a candle/play instrumental but neutral type music or nature sounds - if at home. All sensory things that will engage a different part of your brain. Watch something you are engrossed in that makes you normally feel better. Just go outside and look at the sky. The tree tops. Listen to the sounds. Go buy yourself something cute. At home you can even make up a basket that has stuff in it that is comforting - puzzle books, slippers, idk just some stuff that makes you feel better that you can grab if you feel really bad. Sometimes I just had to curl up in a ball on the floor (at home) and hug my knees till it subsided.
If possible exercising just routinely can help get rid of excess energy and help your whole nervous system. I think it might help also with feeling more in control and in touch with our own selves. I don't do this, lol, and I really really need to. I'm great at explaining it though, haha. I truly do think it can help though.
At the same time you can know it's just a normal reaction to very abnormal people - it's your brain/body trying to heal itself. If you can do therapy, (and be careful, there's lots of crap therapists but occasionally really good ones - listen to your self and quit a therapist asap if it feels at ALL not good) then I think the idea is to deal with bits of this in a controlled way when you are in a safe environment with a SAFE person. It has helped me a lot but not completely but with the right people it DID give me a lot of relief.