I worked at an animal shelter where our humane officers kept getting calls about a very skinny golden retriever mix. Every time they checked in, she had plenty of good food and water. Finally, the dog was taken to the vet, and voila, she was diabetic. Almost immediately after recieving insulin, the dog gained weight.
I know it's hard for both people and pets who are diabetic. It took a year before the doctors were able to find the right dosage of insulin for my brother. What I would suggest is call the vet and let him/her know about the vomiting. It may be as simple as giving a lower dosage, or trying another brand or form of insulin. Depending on the vet, they may be able to give you some advice/options right over the phone, no extra cost. Also, ask about what foods the vet suggests putting your cat on. There are numerous types and brands of prescription or condition specific foods (i.e. weight gain, urinary tract, renal health, cardiac health). Remember to still make that switch in diet gradually.
Anyway, talk to the vet about decreasing the dosage or trying another type of insulin. It's frustrating because it's often a game of too high or too low. Once you've finally stablized your kitty on an ideal diet and insulin dosage, you'll notice. And once stable, diabetic animals can do quiet well, just like people. Unlike people, animals can't always tell you exactly what's not working for them.
Good luck!
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