Hi..yes, hydronephrotic kidneys hurt like hell!! Since you don't want anymore surgery, than I would suggest taking the pain meds. I take potent pain meds daily (Fentanyl...Fentanyl is 100 times stronger than Morphine). You won't need that. I take that due to chronic pain from my kidneys. After your body adjusts to the pain meds (no more drowsiness, etc.) you will completely normal without pain or minimal pain, though. Why torture yourself. If you need the pain meds, by all means, take them. You won't be an addict, you will just be dependent upon them if you take them everyday. That's called physical dependence, not addiction.
Physical dependence is a normal thing when taking long term pain meds. Addiction is totally different. Also, pain patients are very rare that become addicts, less than 0.1%. Addiction is a psycological disorder where you crave these meds and do anything to get them and taking them for no medical purposes. To put it this way, if the pain meds improve your quality of life, you are a pain patient. If the meds destroy your life, you are an addict. Does that make sense. Please, please, talk with your doc and stop putting yourself though this hell, ok??? Take care!