I'd been wondering, all week, why I was feeling so low and out of

I'd been wondering, all week, why I was feeling so low and out of
sorts ... but it never occurred to me that a giant leech had been
sucking blood out of the base of my spine all that time; and now
the goddamn thing was moving up towards the base of my brain, going
straight for the medulla ... and as a professional sportswriter I
knew that if the bugger ever reached my medulla I was done for.
(Hunter S. Thompson)