Joe the Barbarian by Grant Morrison

Grant Morrison's Joe the Barbarian is a psychedelic journey from a bedroom at the top of the stairs to the kitchen and beyond. Sound strange? That's because it is. 

Home alone after a disastrous day at school, Joe realizes that things are about to get a lot worse. Joe has type 1 diabetes and he hasn't eaten since a few schoolyard bullies stole his snack earlier in the day. Home alone except for his pet rat, Joe descends into a hypoglycemic delusion. His house is now the Iron Kingdom and his coming has been foretold by its inhabitants. He is "The Dying Boy" and only he can save them. Joe agrees to help, but first he needs to get downstairs and drink a soda.