My brother has sharp pain in his head. He first had a sinus infection and went to the doctor and got antibiotics, it worked for about 2 days then it came back. He would wake up in the morning with a really bad sinus headache and he would throw up. He's sensitive to light and this all has been going on for two weeks. Any idea of what this can be? Doctors say it's just a virus but he is in some serious pain, missed alot of school. Help please 