Hi there,
Reassuring that the eGFR change has been modest. It's also very important that you have no proteinuria. I agree, 3 years of daily NSAIDs could have played a major role. Now that you have stopped, while yes, the damage has been done, the rate of progression can be fairly slow if at all. All of this is predicated on the assumption that you have no other underlying disease contributing to loss of kidney function in addition to the above.
Jordan