Kinda late to this. I understand having a child delusional. My son just got out of the hospital for homicidal thoughts last monday. He thought this girl from middle school made our cat midnight sick who was put to sleep bc of complications due to diabetes.
For my son it has always been brought on by weed. It's so tough seeing our children struggle with psychotic symptoms. I can't believe they didn't take your son's issues seriously. That's bs. Does he have a regular pdoc? So sorry you're struggling with this.

feel free to pm me anytime.