have him tested IMMEDIATLY
I agree with Firefae. Those numbers are in the diabetic range and he is showing symptoms. Take him in and get an A1C done (an average of blood sugars for a couple months) to see if he is diabetic. If his numbers rise and he is not treated, he could start to show symptoms of DKA which are similar to a flu and vomiting and that is a medical emergency.
i took him last tues to the endo and they sent him for an a1c, gad65, an insuin antibody, a pancreatic antibody, and IA 2 and a basic metoblize panel will let you know what results are they havent come back yet
Sounds like your endo is on it, buddlemama. Let us know the results. If he is diagnosed, send me a PM and I'll give you the name of a website with lots of diabetics including parents.