GYE says thats a slip not a fall, so that sounds like a victory.
I am still very much struggling with M. etc., but Iv'e learned (at least for me) that the triggers that are out of our hands to avoid aren't our responsibility, if they cause falls the problem is more internal.
You wrote about not being able to change the past, maybe try to work on taking the struggle on day at a time - forget the past and future, only the present moment is important. I'm new here, and this is helping me a lot. (If at first it seems easy to feel that way, know your fooling yourself, 'cause it's not).