If he is passing proper poos he hasn't got a blockage,pity the other half didn't get him fish because if his tum is a bit sore being loaded with biscuit wouldn't help,I would say that if by Monday he is still vomiting even though he is bright I would still get him checked out or before if things worsen,try him on a small amount of natural yoghurt,good for gut bacteria if pro biotics are not to hand....