What is a cluster headache? A first-person account of the most painful condition known to man
(WorldNews Health)

Warning: the videos below showing people having a cluster headache may be disturbing for some. It wakes me from a deep sleep. The agony is all-encompassing. It feels like having a white-hot screwdriver thrust through my eyeball and left there. The screwdriver is then wired up to an electric current and the voltage is continually increased. My sinus feels like it has been washed out with acid, my temple is swollen and hot, the area under my cheek burns, my upper jaw feels like I have a toothache......