My go-to practice for this sort of experience is one that is referred to as compassionate abiding. Here's a link to a description of the practice:

Relieve Distress By Allowing It: Compassionate Abiding 101 | Mindset: Perspective Is Everything

And then here are links to 5 articles, from PsychCentral's archives, that may be of some interest as well:

Scientists Find a Better Way to Deal With Bad Memories

9 Ways to Let Go of Stuck Thoughts

8 Tips to Help Stop Ruminating

Learning to Let Go of Past Hurts: 5 Ways to Move On

https://psychcentral.com/blog/lettin...dium=popular17