Glad it worked out, but...
This is just a PSA of sorts to anyone who every finds out their cat is diabetic...
You must either treat it or put the cat down. You can not let it "run its course", as untreated diabetes is a very slow, painful death for the cat. What happens is that the cat loses so much weight to the point that the body literally starts feeding on itself, and the kitty will starve to death.
I'm quite sure no vet would ever recommend no treatment as a humane course of action for a diabetic cat, but just wanted to throw that out there.
I am mama to a diabetic kitty, and I must say that the shots are no big deal at all. Because you do it at the scruff (a non-sensitive area), it's not painful. My cat doesn't even flinch, and barely notices.
Feline diabetes is a totally manageable condition, and owners should never feel like it's a death sentence. My cat has had a happy, healthy two years since his diagnosis, and we expect him to stay around for years to come.