My JRT is on meds for vomiting and diarhea and he is doing much better and can actually drink water now wout vomiting.The vet thinks he may have pancreatitis but is not sure.now he is shivering?

Yes, my JRT had the same thing. Pancreatitis or Gastroenteritis. The culprit in my situations was too much treats and human food. When she vomited the first time I noticed bits of dog food, cat food, dog-jerky treats, pork (from my dinner plate), and grass. Now she is on a stict dog-food only diet. No treats, and no human-food. I keep an eye out that she keeps out of the cat dish as well. She has recovered, but she almost died from it and my vet bill was $1300. I won't be making that mistake again no matter how much she bats those beautiful brown eyelashes at me.