The oxygen tank sits in the living room of Joe McKay’s home, discreetly positioned in the corner next to a couch. It’s there in case the beast comes for him at night. “The beast” is the insider term for cluster headaches, a debilitating condition McKay has coped with since the spring of 2002 – shortly after he spent months clearing the pile of rubble caused by the destruction of the World Trade Center on Sept. 11, 2001. More.
'Insane, stabbing, burning pain': Ground zero workers still battling 9/11 health problems