I'm just on my way out the door, but boy do I have a ton of info for you. For starters, please go to this website:
http://felinediabetes.com/ and read. Then read some more. There's a lot to learn about feline diabetes, but it can easily be treated and with the right combo of food and insulin, SOME cats do eventually go off of insulin.
Some questions for you to answer in the meantime:
- What insulin is your cat on? And how much?
- Has your cat ever been treated for anything with steroids?
- What does your cat currently eat?
And what's your cat's name?