Sounds like a concussion. See a doctor. If you're experiencing symptoms the day after, its a good bet its serious. Its better to get a doctor to rule out a fracture, then to have one and not get it taken care of.
He hasn't logged on since feb 2. However this member isn't on that regularly. He can go on days/weeks without posting then come back to post again. I guess a better thing is, OP if you see this, give us a sign that you're well.
Steve is right, he could have slipped into something dangerous. When my kids bump their heads it's what we look for...signs like unusual drowsiness, loss of consciousnesss, vomitting, etc.