cluster headaches
"I am 51, and have been getting cluster headaches since 17. Have tried every medication for them, but nothing seemed to work for me. I  was finally prescribed Prednisone, it takes a few days to start working, but after I  finished the course, I  didn't get a single headache for nearly a year. The course was 20 mg a day, for 10 to 14 days, depending on the doctor. The length of time, without a headache varies, but is usually a year or more."