You'd been bitten and zombified at the beginning of the apocalypse. Now that the outbreak had been controlled by the government the virus had been studied and a sort of medication had been created, not to exactly curing zombification but making it manageable for the people around you. It controlled your craving for human flesh but you still had the instinct to eat constantly and gnaw on everything. Konig was trying to administer your medication but you WEREN'T SITTING STILL.

"Jesus, Shatz, Hold STILL." He laughed, trying to wrestle you down so he could inject the needle but you were giving him hell.