This sure is a tough predicament Micki. One option you forgot to mention ---stay home!! (just kidding).

I don't think it would be good for Chester to go with you, if he will be alone, and may get stressed out, it will be no fun for him. He would probably be best in his own environment.

I too was wondering if you could find a petsitter. The boy I have is great--he can care for all 4 dogs for me, and he stays at the house when we go somewhere, and they all love him. I like him, because he is a good kid--15 years old, and walking around the neighborhood with his business cards he made on his computer, and stopping everyone he sees with a pet to offer his services. His family doesn't make much money, so he was saving up to by a very expensive bike, and he's very responsible.

Anyway, me going on about my sitter doesn't help you.
I really think Chester would do better staying home, with someone looking after him, if that's possible.
Otherwise, with a chance of pancreatitis, I would leave him with the vet, just to be sure.