How painful is an insulin overdose and how long will it take to die from it?

Hypoglycemia: Insulin over dose can range from mild to severe. Prolonged low blood sugar can result in irreversible brain damage and even death. Mild symptoms which occurs more frequently may include headaches, tremor sweating/fatigue, irritability and extreme symptoms or 'Insulin shock' is a medical emergence. All patients on Insulin should be educated to recognize signs/symptoms/management of low blood sugar.