You might want to get another ct scan to see if you have another stone. You could have smaller stones causing the pain or another large one.
I wish you good health,
I have been going through the same thing for the past year. After many tests and med changes I finally came to the conclusion that my Crohn's inflammation was causing my kidney pain. Once I got the inflammation under control the kidney pain subsided. It took a lot of steroids, but now I am only taking Imuran and Asacol. My docs didn't give me any explanation. But you know Crohn's disease....... once you think you have it all figured out it throws you something else.
Wishing you the best