Dont ask for advice to see a doctor when you get slammed on the head. If you dont, you cant have any claim.
ALSO, lemme say that my experience in mining insurance claims (Its related here so shut up). An insurance company will argue their asses off that you didnt get mwedical treatment in that critical 8 or 12 hour window, so any claims are actually invalid because you have made the situation worse by not treating it sooner.
TRUST ME, they will say that , so dont give them any ammunition. The restaurant has liability insurance and E/O insurance, so dont be askin questions fool. Get to the docs, if you have a concussion or worse, you wont have the chance to make a claim if you asit around asking douche bags like me for advice.