He has not eaten since Wednesday evening, apart from a couple of chips and a few mouthfuls of his Birthday cake yeaterday, I assume he has this flu going around, though he does'nt seem poorly enough for that IYKWIM. He is naturally very thin and seems to be fading in front of my eyes, his eyes also look like they have sunk in slightly, so is a trip to the gp necessary or am I worrying too much about his lack of appetite. He is 5 BTW.