Check out the website: hypoglycemia.org for lots of information about hypoglycemia. It sounds as if his cause is not the usual cause, but he may be able to find some relief with the suggested dietary changes. I wish him well.
His body is having problems with proteins because you cannot absorb glucose without enzymes. This is a problem with diabetics. He has diabetes in reverse. Very common I don't understand what the problem is. Jack him up with glucose until his pancreas relaxes. No Problem.
You might want to avoid foods that might trigger hypoglycemia -- these seem to be things high in simple sugars and carbs. Eat some protein with foods that have carbs so as to slow down the digestion and absorption of those carbs, and avoid sugary caffeinated drinks, for caffeine can be a real problem for people who deal with hypoglycemia. Some people find that they can stave off hypoglycemia by eating small snacks often throughout the day rather than huge meals.
--that was copied from an answer posted by another volunteer on 7/23/2007, who is very knowledgeable on the subject of hypoglycemia. She also suggests this website www.hypoglycemia.org/ as being very helpful.
I am sorry that I am not being more informative but I do not know much about about hypoglycemia being a Type I diabetic. But I hope that website will help.