I know you have a scheduled appointment tomorrow for catheter removal, but obviously the pain is worrying you, so why not put in a call now to let him know about
it and see if he thinks there's any cause for concern.
I'm nearly a year beyond my surgery, but I've been having pain in that right kidney area, and then back pain for a month that has now diminished, but mine definitely feels like an over-use injury. I'll discuss it with my doc when I next see him on Aug. 1.