Hi, I had gone through your query and understood your concerns. Usually head ache is not related to insulin as long as blood sugar are normal to above normal. Head ache only appears when blood sugar levels are too low, the condition which is called hypoglycemia. In your husband s case as the sugar levels you mentioned are a little higher to normal, head ache is not related to it. The probable cause could be Hypertension, ie., high blood pressure. Please visit local physician and have BP check up. If that is normal, then ask him for complete evaluation. Hope this guides you. For any other queries you can write to us. we will be happy to help you. Thank you. Dr Phanindra Dulipala Diabetologist.