Unfortunately there is no quick fix to pancreatitis, but good vet and home care makes a huge difference. You are doing all the right things, your vet sounds very on the ball, and you are getting lots of good advice here. I attach the link to the story of my daughter's cat, Mina, who went through this exactly a year ago. She is an indoor cat, so the cause was not outdoor snacking. Since she got better she is on a grain free diet and has been fine. But it is a nasty disease. We here are all rooting for you.
http://www.thecatsite.com/t/252412/mina-is-very-sick
http://www.thecatsite.com/t/252412/mina-is-very-sick