My Son
My son has ADHD and Aspergers and I know the routine is what he thrives on. If I'm 10 minutes early or 5 minutes late with something he expects it can be a nightmare. For me it's not so much a trigger as a routine that allowed me to get into a drinking routine too. I don't know what medication your child might have been prescribed, but it sounds like it's time to talk to his dr about what you're experiencing and also talk to your doctor about what you're experiencing.