Verapamil
"Hello, I'm a 36 yr old male suffering from chronic cluster headaches since the age of 19. For the first 15 years I would get 1-2 attacks daily with a week being the longest without an attack. I tried everything from nerve block injections to pain meds with nothing being effective and doctors thinking I only suffered from migraines or just wanted pain meds when all I ever wanted was any kind of relief. A few years ago they started getting worse and the attacks increased to 4, 5 even up to 7 a day. Imigran 6 mg shots helped when I got one at work but who can take that many shots a day or live in that kind of pain. I finally read about verapamil online and tried 240mg a day first and it completely changed my life. Unfortunately they have now returned"