I totally get what you're going through. For me, every minute not spent thinking about the X is a minute of triumph. I have slowly worked my way up to stretches of hours.
Now when I accidentally start to wonder about him again, it doesn't hurt so much any more. But I know I have got to keep it in check and start getting busy again.
You can call me Dory/ Grl.
As a wise fish once sang,"Just keep swimming!"
It's no use to go back to yesterday because I was a different person then.