My six year old has been complaining of severe headaches with sudden onset, usually at night. He has to go to his room turn lights off, close his eyes and lay down. The pain is so severe he starts crying and loses control. No vomitting. I give him childrens motrin and it takes a while for him to start feeling better. He s so drained he just falls asleep and will not wake up until the next day. No fever or other symptoms go along with these. He was just referred to a neurologist by his pediatrician. What could this be?