Constant Kidney Pain

I had reflux surgery 40 yrs ago at the age of 5. For the past 10 yrs I have pain in my right kidney. I have had IVP, nuc scan with lasix,ct scan.
My blood and urine come back normal(except when I have infection). When the pain is bad I suffer frequency with small output, sometimes burning and smelly urine, I then take in a sample and it comes back okay. My right kidney fnctions at 24% and is small, my left normal but slightly large. The pain is on the right and I experence it every day at verying degrees. The urlogist says he can remove the right but does not really want to until it functions below 15%. I am tired of having pain every day. Does anyone know what this condition is called or have any ideas on how to cope with the pain?