Zagdog, I know exactly what you're going through. The renal diets are very high in fat which often leads to pancreatitis, especially in small dogs. Feeding Hills K/D caused my kidney compromised yorkie to develop chronic pancreatitis. If your yorkie's kidney numbers aren't too high, you might be able to feed Royal Canin GI lowfat (its an RX diet) to get over the hump until you can get advice from your vet. I could not find a commercial diet that worked for my little guy and ended up home cooking for him for a couple of years.
DogAware.com Health: Kidney Disease in Dogs
The kidney section of dogaware has some good comparisons on various commercial foods and also some recipes for home cooked food. There is a lot of info to wade through but you might find something that would work for your dog for now while you're waiting to get him into the specialist.
Sending good thoughts for your baby.
Diana