How to make it stop?

The tape on constant loop in my mind about how I've been done wrong, lied to, misled, wasted years of my life, failed to see what was in front of me, how could I be so stupid, why couldn't she be honest, how did my boundaries get smashed, how did I let this happen to me, what happened to all my strength, why couldn't she return my support, why did I believe what I was TOLD . . .
why, why, why?!?!?!?!?!?!?!?!??!?!!?!?!?!?!!!!

I'm getting on with my life, the days get better. I'm functioning, but still not near full capacity. I don't despair over a lack of her, just over the injustice, and my own lack of perception.

Any tips to shut down the near constant thoughts running through my head? Or is it just a case of suffer until it stops?

I tend to think it's the latter, but just had to complain a little here.