I had proteinuria and it is a potentially serious condition if left untreated. Most patients are treated with an ace inhibitor like lisinopril. My feet, ankles and legs had severe edema and it eventually went away with a relatively low dose of lisinopril.
It is important to see a nephrologist and not let your kidneys be damaged permanently.
A kidney biopsy will determine if there is any kidney damage and how much. Fortunately, I had little and my kidneys have returned to normal function. I will probably take linsinopril for the rest of my life.