Has Type II Diabetes, Copd, Muscles Hurt, Had Heart Bypass in 4/2011; Will GB Help Me Avoid Dialysis?

63 yrs old male; Nephrologist said that I will be on dialysis soon; that diabetes, heart & breathing problems,& being overweight (270 lbs at 5'10'') all put stress & damage to kidneys (GFR= 20), which cannot be cured. The path to dialysis can be slowed down, with proper control of blood sugar, losing weight, strict diet, exercise, etc; that dialysis, is a continuing lifetime treatment. At my condition, will I be allowed to get gastric bypass surgery (Laparoscopically) to avoid dialysis-main aim.