My boyfriend suffered from Polycystic Kidney Disease (PKD). It's an autoimmune condition. He ended up in ESRF (end stage renal failure) and received a transplant 3 years ago. In order for him to keep the kidney, he's on A LOT of anti-rejection meds, of course. But, I also cook a very strict diet for all of us. LCHF and paying attention to potassium levels. Very high amounts of protein can be harmful to your kidneys, but I'm talking very very high.
Meet with your nephrologist and ask what he recommends. Good luck.