Oh poor baby Millie.
Izzy was just diagnosed with pancreatitis week before Thanksgiving and was hospitalized for three days on IV and meds. She now needs to be on a low fat/low protein diet for the rest of her life.
Her Lipase, too, was over 5,000 which was mind boggling since she was only on holistic food and treats since I got her but even though the best still high in fat and protein.
Stop the cheese I'm sorry to say and watch the fat and protein of all her foods. Izzy is now on Science Diet Prescription WD for about 4 months to calm it all down and then we will go to half that and half home cooking.
It's frustrating and sad but with the right info and tools your baby can pull through this.
I don't know what your monetary situation is but we also had a consult with a great nutrtionist and doctor out in California who helped us out so much.
Good luck and let us know what your vet says.