In our Iodine book we tell the story of a woman who was being seen by Dr. Flechas who was diagnosed a diabetic and on insulin treatment. Dr. Flechas put her on high dose iodine therapy for another problem, and she was able to come off her insulin because her blood sugars got into better control, registering within normal limits. So there is hope for your son with iodine . But please note that very high doses of iodine must be used and Dr. Flechas used Iodoral tablets (the tablet form of Lugol's iodine
Here is an online article about using iodine with diabetes.
or please see our sites on Iodine and Diabetes for more information and the associated books.