Though the Dutch gamer anonymous clinic has been booked like a mug, more disturbing is one gamer's story of how he barely left his room in over five years due to gameritis: "My room was a mess... Curtains drawn, pizza boxes, empty bottles and junk food wrappers everywhere... I didn't even get up to use the bathroom but peed in a bottle while I kept playing."
Hardcore or not, peeing in a bottle while playing "computer games" is probably a good indication you should check into a clinic. In all seriousness, though, props to the man for seeking help.
[Update 1: Changed to less offensive (less funny) peeing in a bottle pic. Bad judgment on my part. Sorry folks!]