11 week old puppy was fine all day playing on beach like normal, then home and a long nap, woke up and seemed like he was going to puke. Then he started shaking head back and forth like a bobble head and seemed wobbly on his legs. He drank some water and went back to sleep and doesn't seem to be in any pain. He just had his second round of puppy shots yesterday and the vet said he was healthy. Of course the vets closed. Any ideas on what thus might be would be appreciated.