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.
Anemia. Diabetes causes severe fatigue, weakness and tiredness, because the body's metabolism is affected by the inability of glucose to be transported into the body's tissues. Anemia is a blood disorder with the same symptoms of weakness and fatigue.aynaud's Disease. Diabetes may cause diabetic neuropathy, a condition in which the nerves become damaged due to decreased circulation in blood vessels of the limbs. Neuropathy involves symptoms of tingling or numbness in the hands, feet and lower limbs and decreased sensation and pain in these areas.