Originally Posted by never mind
I re-read where the OP said he hit his head pretty hard. You are correct, if you hit your head "pretty hard" the helmet should be binned or sent to the manufacturer for evaluation before using again. I glossed over the "hit pretty hard" part... Thanks for the clarification.
I was just concerned since existing helmet damage may cause severe problems in a later crash later. I knew someone who's helmet cracked in half when they hit really hard, it was an older helmet they had thrown down and used a lot. Luckily the guy was OK but could have been tragic. You only have one noggin!