How To Reduce Creatinine Levels In A Diabetic Having Thyroid Cancer?

I am a fifty year old woman. I weigh 305, I was diagnosed with hypothyroid 6 years ago, this year they found thyroid cancer, since I have had the surgery twice to remove the cancer, I have had all kinds of high test levels of bun/creatinine levels. I am also a diabetic with an a1c of 5.6 and that has been pretty steady. I have high blood pressure but with meds it has been 105 over 60. My cholesterol levels have been bad but seem to have gotten worse after surgery. There is a slight little piece of thyroid left because it is attached to the vocal nerve and was to risky to remove. Is there any way to reduce the kidney levels. I do have a prolapsed bladder after having five kids, could this be a problem causer. Oh yeah I have been losing weight a little at a time.