Benadryl (diphenhydramine) is an antihistamine that reduces the effects of natural chemical histamine in the body. Histamine can produce symptoms of sneezing, itching, watery eyes, and runny nose. Benadryl is used to treat sneezing, runny nose, watery eyes, hives, skin rash, itching, and other cold or allergy symptoms. Benadryl is also used to treat motion sickness, to induce sleep, and to treat certain symptoms of Parkinson's disease.
Diabetic headaches have several causes. Photo Credit Jupiterimages/Comstock/Getty Images. Diabetes impairs your body's ability to produce or use insulin, which regulates blood glucose levels and generates energy. In type I diabetes, the pancreas does not produce insulin. Without insulin, too much sugar remains in the blood and becomes toxic, leading to fatigue, neuropathy, headaches, blindness and death if left untreated.
Common symptoms of diabetes: 1  Urinating often. 2  Feeling very thirsty. 3  Feeling very hungry-even though you are eating. 4  Extreme fatigue. 5  Blurry vision. 6  Cuts/bruises that are slow to heal. 7  Weight loss-even though you are eating more (type 1). 8  Tingling, pain, or numbness in the hands/feet (type 2).