Someone taught me this useful thing early on here:

If you were watching a really upsetting movie that disturbed you - would you keep watching it? Over and over?

Of course not. So WHY keep replaying over and over this most painful thing that is happening to you?

When it starts up, imagine a BIG RED STOP SIGN.

Then put on some happy music (no sappy country songs allowed!)and do something else. Stop watching that bad movie.