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There is good treatment available for migraines. Does he get watering eyes and runny nose, as well during the headache. He needs to avoid bright light, loud noise, cheese, chocolate, smoking
, alcohol. The triptan group of drugs are very helpful to abort an attack. But best would be if you consult a Neurologist
to get him on prophylactic treatment as well as immediate treatment to stop the attacks. This will prevent further attacks as well. Eat healthy. Drink enough water. Exercise daily. His Diabetes
needs to be under control as well with proper diet and exercise.