Hi Katyanne,
My sister also has chronic yeast infections, and UTIs, too, and I know how terribly frustrating that can be. I am not a doctor, just a volunteer with a diabetic teenager, so I can't give you any medical advice. I will say that it could very well be that the yeast infections/UTIs bear no relationship to the diabetes.
Have you tried Diflucan, the medicine that stops yeast infections right away?