Would your vet work out a payment plan for you? It does sound like Rush should be seen again. If he has some tummy trouble, he may be able to use the insulin he is used to once that part is fixed.

With the pancreatitis, that could be affecting things. Stay with the vet you have, if possible.

You might try some plain (no sweetening or flavour) yogurt to restore the flora in his digestive tract. My cat loves it - you may have to put some on Rush's paws to get him to lick it.

Please work something out with your vet moneywise...it sadly sounds like you will lose Rush if you don't. As you know, with diabetes he can eat and eat - and even without throwing up, he will still lose weight.

HUGS! Please keep us posted.