I’m so sorry OP - it’s really hard and I’m glad you are empathetic and not shaming him.
Might he still have encopresis? I’m asking because going every few days might not be frequent enough. Has he had an x-ray to see if he still has compacted stool? We had to stay on the Miralax regimen for our DS much longer than I originally anticipated in order for his colon to return to normal size so he could feel the urge sensation.
Is he sitting on the potty every morning 10-15 min after breakfast, but before school, so he can try to have a bowel movement?
We’ve also had success with parent coaching on this issue through Alliance Pediatrics — they are known for their focus on toileting.
https://alliancepediatrics.com/