MSPCA-Angell: Nutrition Team Faculty of the College of Veterinary Medicine - Joseph J. Wakshlag William R. Pritchard Veterinary Medical Teaching Hospital Faculty and Research : Cummings School of Veterinary Medicine at Tufts University
These are veterinary nutritionist who can (or should be able to) formulate a balanced recipe for you. Most recipes that you'd get online aren't going to meet AAFCO or NRC guidelines. And because you need a therapeutic diet, it's best to talk to a nutritionist anyway.
Although I vaguely remember Ladymom posting a recipe for diabetes before...