my son also started displaying similar behavior around 10 months old. It seemed to be a temporary experiment with a way of showing some frustration or unhappiness. He banged his head around a little bit, too.
But we never paid the behavior much attention. Instead, we tried to offer something to distract him, or tried to figure out what he was asking for. He seemed to appreciate when we could respond a little better to his very limited communication skills.
So that's my advice - just let him vent his frustration and continue to try to communicate with him in a positive way. As he develops his language and pointing skills, he'll eventually move on to other ways to express himself.
BTW, our son is now 19 months old. the stage where he was hitting himself and other things passed a long time ago. Now he's moved on to much BIGGER behavioral challenges. lol