Thank you - not sure why both on the Pecid and Prilosec, but she said both. I only did the skim milk thing once and not since (realized the digestive issue). He had a full blood panel the month before when the vomiting started and everything was fine. He's also epileptic, so he's been on phenol for several years now, probably at least 5/6, so we were concerned about all of his functions, so he gets blood work done every six months anyway, but the full panel last time showed everything good. He will drink other things, just has never not drank water before - and am concerned as to why he's stopped now.