You should report that guy to the franchise manager, or whomever is his superior. If you were knocked unconscious, and he kept you working, not only did he jeopardize your safety and health, he left himself and the restaurant wide open for a worker's comp lawsuit. Like Cream said, look into worker's comp. You might be eligible.
My friend, who drives an 83 Corolla, had his car broken into. They were able to jimmy the door open. When they got into the car, they tried to take his stereo, but when it got to be too much trouble, they just left it hanging. Then, they took his cellphone (a cheapie prepaid phone, so no big loss) and locked the door back. They even figured out that you had to hold the handle a special way to get it to lock. Really, when you see a parking lot at an expensive apartment complex full of SUVs, Maximas, Camrys, even BMWs, why on earth do you go for the 1983 Corolla with the plaid interior and a rope serving as a backseat handle (hanging from the roof)?