Benedryl or namely Diphenhydramine(the chemical name) can give you a feeling of euphoria. It is not safe to take in large amounts and should not be used in this manner. but if you are going to BE VERY CAREFUL! 25-50 mgs is the normal dose. if you take more than that you could go into respiratory or cardiac arrest.
Insulin deficiency (symptom description): For a medical symptom description of 'Insulin deficiency', the following symptom information may be relevant to the symptoms: Diabetes-like symptoms (type of symptom). However, note that other causes of the symptom 'Insulin deficiency' may be possible.
It increases the rate of synthesis (blending) of glycogen, fatty acids, and proteins. Lack of insulin causes diabetes mellitus (a disease characterized by excess sugar in the blood and other body fluids). Insulin's most important feature is its ability to increase the rate of glucose (a crystalline sugar) absorption by cells.