Suggest Remedy To Relieve Constant And Severe Headaches

Hi my fiance has been having headaches for the past month. The headaches are so bad that he cannot get out of bed. He drinks about 8 advils and the pain does not go away. This has been happening for about 4 weeks. We went to the emergency a week ago and they did a cat scat to which the results did not show anything. Please help us...