I did'nt see it happen and there is no bump, have called NHS who said to just keep an eye on him, just seems strange that he was sick and very sleepy within a couple of hours of it happening. I kept him awake for a further 3 hours and he is now in bed fast asleep, am hoping he just has a bug and that the bang on the head was just coinsedence.
Surely if the bang on the head was bad enough to cause the voniting and tiredness he would have a bump???
He has only been sick once but said his head was still hurting when he went to bed.