My 16 yr old son had elevated Insulin level 18.1, and fbs of 102....he has 25 lb weight gain, tired, inability to focus/declining grades, hunger/thirst...went to get cortisol/acth levels done all OK, Fasting insulin level came down to 14.9 (was checking fingersticks ranged 83-157 highest) and fbs 100....Now sgpt slightly elevated too....they ruled out mono/lyme/cushings, adrenal fatigue...BUT he is still no better....Help? I am an RN. Suggestions?