I feel you. I deal with the same thing. I play back many of the traumatizing memories over and over during a typical day. It can ruin my perception of reality. What's helped me is realizing that I overcame those situations. I left my abusive family. I went on to be a functional person. I've done some cool things. Sure, those memories come and go. The human mind has no concept of "letting go", because time is irrelevant in the human mind. While it can understand it in an abstract way, it doesn't process it in totality. So, those traumatizing words and actions are always there.
The thing that I try to do is control it by reminding myself that I overcame those situations. The people who inflicted all of those things on me are not relevant to me. They have no power over me. And if, by some chance, I meet them again, their words have no affect on me. They're trying to communicate with someone who no longer exists. I've grown. And if they're approaching me like it's yesterday, then it's obvious that they haven't. Plus, none of the people who abused me are doing any better than I am in life.
Those feelings and thoughts will always be there. The way to fight them back and keep them at bay for a long time is to remind yourself of the life you have now and the fact that you've overcome that situation... if you have. I wish you luck and peace.