Have you looked at his diet? Dd1 was getting feral and we finally worked out food acid 330 was the trigger for her. It's in a lot of foods including ones you might think are healthy.
WOW 330 is in about everything Black rose! That'd be TOUGH to cut out!

Thanks for reminding me about diet too. DD's trigger is 282 which is found in most bread or bread products. It's mightysoft bread or Brumby's all the way for us. SHe was a little DEMON prior to us removing that from her diet! I really didn't know where my child had gone on days where she'd just had plain bread and butter for lunch! Maybe google the failsafe diet for kids. It listrs all of the additives and foods to avoid. That can be a basic starting point! DD is fine with tomato and broccoli (no no list) but I tested it thoroughly first!