Halting progression is possible, and reversing damage is possible in some cases.
First, you need a diagnosis which you do not have.
Diabetes, high blood pressure, autoimmune kidney disease, all need to be ruled out.
A high creatinine that has gotten worse is serious.
A GFR of 40 is serious.
This is not likely from nsaids alone.
See nephrologist immediately.
A vegetable protein only diet, or low protein diet, and ACE inhibitor medications are the mainstay of arresting kidney failure.
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