Thanks for sharing this difficult experience. I'm not a mental health professional. So I can't offer anything in the way of an official perspective. But this certainly sounds as though it would qualify as a PTSD-inducing experience to me.

Here are links to a selection of 9 articles, from Psych Central's archives, that (hopefully) may be of some help just in case you're not already familiar with them:

Posttraumatic Stress Disorder (PTSD) | Psych Central

Coping with Obsessive Thoughts

Why Can't I Shut Off My Mind?

Some Ideas to Help Stop Obsessing

9 Ways to Let Go of Stuck Thoughts

https://psychcentral.com/blog/why-de...-calm-anxiety/

https://psychcentral.com/blog/reduce...eep-breathing/

https://psychcentral.com/blog/4-brea...ess-right-now/

https://psychcentral.com/blog/unders...al-flashbacks/

My best wishes to you & your family.