That's why I suggested you that technique. Basically, you start to pray for the people that made/make you suffer. I know, it's not easy but you just let go and do it for a few minutes. You visualize them in peace and harmony. And then, you visualize yourself in peace and harmony. You have compassion for them and then for yourself.
You don't even have to be a spiritual/religious person. This is a visualization exercise, a personal experience. And it's not in vain, I used it in the past and I had tremendous results, you'll be surprised. I was surprised! And yes, I used it for people that were indeed making my life a nightmare. After that I did find my peace and harmony. And they found theirs too, or at least a little bit of it. Yes, they changed their actions towards me. And I changed my reactions towards them. It's liberating for you.
But you'll have to actually do it in order to see results.