Life's been good to me so far

I know you said it wasn't blood sugar related, but I would maybe look in to that a little more and see if something is getting overlooked. Maybe check blood sugar throughout the day for a while to see what it's doing? It's possible he just has a lightning fast metabolism and needs to eat a LOT, but the meltdowns and freaking out in between meals seems concerning to me. Also, maybe he needs some more fat- and protein-dense food? It's awesome that he eats so many veggies, but you mention a lot of oatmeal, veggies, fruit, bean soup, water and I wonder if eating more fat and protein at meals would help him stave off those emergency situations. Obviously he's eating some, and maybe enough for most people (bacon, beans, etc) but he might metabolize the carbohydrate foods faster than others. Oatmeal fills me up easily but lasts me about an hour at best, while I'll be fine for hours on a bunch of eggs. The lunch you mentioned would probably be fine for most people, but as a person that needs lots of fat and protein and not carbs to function well, I'd get shaky and feel over-sugared pretty easily on that.