Headaches everyday after bleeding

My son had his 2nd bleeding. After 3 embo in the summer 2006, 2 proton bean radiosurgery in Jan 2008, and a shunt placed in June 2008. He was headache free for 1 year and a half…in Nov he started having headaches (3times a week) no too bad…first week of dec09 headaches in the back of his head. Fallow up appt on Dec the 7th,after a MRI his dr told us that his avm looks the same, more headaches and 6 days later on Dec the 12th another bleeding. Now he has headaches everyday,he stay home,miss school days…Please, Can somebody tell me if this happend to you? Is it pretty normal? He has not come back to his normal activities.