Hi Meghan,welcome to you and Shelby. While it is overwhelming at first, feline diabetes is a very treatable condition. Since you haven't started insulin yet, now would be a good time to start Shelby on a low carb wet food and learn to home test her blood glucose. It's really easy to do and is the best way to keep her safe and know how well the insulin is working. Come to the Main Health Forum and ask any questions you have. We will be glad to help you learn all you need to know to get Shelby on the road to recovery. If you'd like, post the results of her bloodwork we have several members that can help you interpret the results.