He started the last hour headache. He felt pain like a blow to the head. Sometimes it's a pain in the front of the head. Sometimes pain between the eyes Sometimes it's a pain to the head. But, most often headache area behind his head. The headaches caused by his book. It made him read the book, just 15 minutes after 15 minutes, and then he will head it. So he tried to take a break every 15 minutes but sometimes they forget to take a break. And sometimes they have to wait until the headache is gone. This may take up to one or two hours to be able to read it again. But now he has to live with the pain.