David started having headaches 25 years ago. Although he just suffers from them every 3-4 years, the headaches are severe and normally linger for 2-3 months. The attacks start from the inside corner spread to the back of his right eye. They can come at anytime and last 10 minutes to 3 hours. The pain can be so strong that it makes him want to bang his head. After trying various medications for 10 years without any effect, David was sent to see a consultant, who believed the headaches was cau...
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