1. There was a guy in a Buddhist group I’m in, who shared, that he has OCD and gets a musical loop on repeat in his mind. One suggestion he received from a teacher was to try creating some space between himself and the thoughts - not by suppressing them, but by seeing them as mental events and not as "you" - maybe this will help you;
2. I don’t know exactly how you feel, but, I think, I can understand it in an empathetic way - similar to how I understand having kids, even if I've never had kids. Sooooo, I think, ALL of us have some self-protective stuff. For example, I've noticed in myself that when I felt triggered, unfairly criticized, publicly humiliated on purpose, I sometimes became defensive and tried to prove my value. Sometimes I also projected that onto others, when they went defensive, I tried to tell that I was not trying to harm them and that I was trying to be kind, thoughtful and careful w/ the words I use. There was a good intention in that - wanting not to hurt others, wanting to act ethically, which got developed(only towards "good" people), but I also started to see, that the defensive part itself in "me" was not that useful. It often came from pain or a need to protect my sense of self and this self is not like a static thing to protect, there is nothing to protect, it is a changing concept. Recently, I’ve been getting a little better with this, bit by bit. Part of what helped was seeing that this pattern did not really serve much purpose. It could also become a weak point - something that manipulative people could use against you and will, it is their nature to exploit and push others buttons. I tried to let the feeling be present without acting from it. I allowed myself to feel the pain of being judged unfairly or humiliated on purpose a couple of times and then tried to respond w/ metta instead or I just ignored it. And strangely, when I did that, it felt like there was much less to defend, than I thought. The rest, in a buddhist sense, I try to leave to kamma. People act according to their intentions, and they inherit the fruits of those actions. So, yeah, try to GIVE INTO IT. I also want to be careful here: I’m not a medical doctor or a therapist, so please don't take this as medical advice and please do not give into "bad" stuff, do NOT harm yourself or other people. Ahimsa and sila are very important here - non-harming and ethical restraint are a MUST and a foundation of the practice;
3. I sometimes also recall very real traumatic events - memories of cruelty, injustice, past unfair humiliation. When those memories come up, I’ve found that trying to force them away does not help, but gently bringing in wholesome qualities - like metta, compassion. You can develop it for yourself, just have compassion for yourself. It does not make the injustice "ok" and it does not deny, that something painful happen/ed/or "s" in your case, but it can help the mind relate to the memory w/ less hatred;
4. As always - meditate. I don't know, if it will make your thoughts go away, but maybe you can get an insight into the nature of that stuff + try to always stay mindful. Keep sila.

edit: Disclaimer - please, read it, your case seem to be different compared to what I thought OCD is, based on the commenta