A few years ago there were some things that went on at my job that I was extremely upset about and ended up quitting abruptly.I was so upset for such a long time over it,I couldn't sleep,kept re-living it over and over.I felt my life was ruined,I had been at that job quite a few years and the last thing I wanted was to quit.It took months and months to finally stop being upset and ruminating but it did eventually subside.

Your story is different but you're doing the same thing I did.So I understand how you feel.It's not PTSD,it's just ruminating over a very upsetting event that will take time to get over.What made it so hard for me was I was accused of things I did not do and disciplined and felt like I wanted to set things right,wanted revenge,etc.but finally had to accept it for what it was and let go of it and move on.