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.
In type 1 diabetes, the insulin-producing cells of the pancreas have been largely destroyed. In the absence of insulin, blood sugar becomes too high because it cannot be ushered into the cells to use for energy. This produces the classic diabetes symptoms -- increased thirst, increased appetite and frequent urination. In addition, despite eating more, teens with type 1 diabetes often lose weight in the weeks before being diagnosed, largely due to dehydration but also as a result of loss of muscle and body fat. Symptoms of type 1 diabetes in teens usually occur over several weeks before being checked by a physician.