Verapamil
"Spent 20 years trying to get a correct diagnosis of what ended up being Cluster Headaches. Finally diagnosed by a neurologist and started taking Verapamil Hydrochloride 240mg once per day during cluster cycles with amazing results.  Takes up to 9 days to work, but boy does it work!  Amazing results for this cluster sufferer.  Has made my life worth living again.  Side effects are minimal.  If you have cluster headaches then you really need this miracle pill!"