Ds is 10 and has been vomiting since midday. He has a few episodes over last few month. He seems to start with stomach pain and then start vomiting. He has been sick about dozen times and now is just bringing up bile and mucus. He suffers really badly with hay fever and so has been complaining a lot about mucus going down his throat so wonder if this the route of the problem. I keep offering small amounts of water out of syringe but he keeps bringing it back up. I have switched to diaroltye now. He is now asleep should I wake him to offer him fluids ( not much wee today) or let him rest?