I’m disabled from a failed back surgery on NSAIDs and a lot of other meds daily . I stopped the NSAIDs in January when I had my spine stimulator put in that failed 4 days later so I waited to take the Naproxen until the stimulator was repaired finally got it done last Monday. The surgeon done lab work and showed my kidneys are at Stage 3. What should I keep an eye on I go see my NP the 21st hopefully he will do some testing ?