What you can do, Liza, is to fill your present with something new. Happily, there's a finite amount of consciousness available to us in any given moment, and if you're totally engaged -- totally = 100%, not 99.9% -- in creating something extraordinary in this moment, there's not much space for that old moment to creep in.
This is when it is really useful to have a coach or a really daring friend to deliver a swift kick where it counts to get you into action. Just to pick a wild example, if we were to get a little crazy one day and decide to go skydiving together, I absolutely guarantee that as you left that airplane you would not be moping about whatever that was back there that you think you need to forget. (I don't know about you, but I'd be extremely busy screaming and trying to levitate ...)
Since that's probably not going to happen, you could invent something in your own life that would create that kind of intensity and remove the option of dwelling on stuff you can't do anything about anyway.
Here's a thought for you. Whatever it was that happened to you has happened to someone else and probably lots of others someones. How could you reach out to them so they get on with their lives?