I could never play doc for a diagnosis, but I would have retaken the blood test because mistakes can happen. If the test is accurate, I might suspect any new medication that you are taking because it sounds like dehydration. My values went down quickly when I took Torsemide, a diuretic. Another nephrologist favorite is Farxiga where constant urination is a side effect. Colleen is correct in asking about water consumption. I can't imagine a food problem with your lifestyle over a short period of time.