Sumatriptan
"I've had clusters for as long as I can remember ... but they've gotten worse as I've gotten older.  First doc prescribed Frova which didn't help at all, but the most recent doctor I've seen prescribed sumatriptan.  I can't believe how quickly this worked. My headaches usually lasted 3 hours  even after taking 3-4 Aleve.  Sumatriptan has knocked them out in 15 minutes.  I feel a bit jittery after, and have extreme taste sensitivity for a few hours, but it's well worth it.  This medicine is a miracle."