Hi Shirley ( hope that's your name) and welcome to the message board. Would you please introduce your cat to us? Name, sex, age would be nice to know.
Diabetes is a very treatable disease. It's an adventure and there is a lot to learn, but we are here to help you every step of the way.
Would you please give us more of a background on the bladder problems? What specifically is the issue? How diagnosed? Things like that would be useful.
How was the diabetes diagnosed? Any history of steroid use? How are the cats teeth? Any inflammation or infection?
Have you started the insulin yet? If not, my first recommendation would be to switch to a low carb canned food diet. Often, this switch alone can bring the BG (blood glucose) levels down 100 points or more.
Please, ask us questions and let us know how we can best help you. Lots of experience here, not only with diabetic cats, but other health issues as well.