I, too, struggled with recurring UTI's after having a kidney stone lasered in January 2008. (My third episode with stones). I can't have the sound wave bombardment because I don't clot well. I have been on prednisone for noncontagous hepatis since 1990. I tried Imuran but it screwed up my blood count.
Now, I have been diagnosed with end stage liver disease and am on the waiting list for a new liiver. My urologist put on me on a low oxalate and high fluid diet for my kidney stones. I also take 50 mg. of nitrofurantoin before going to sleep at night to try to prevent UTI's. My stones seem to be embedded in my kidney, but don't seem to be growing at this point and my urologist has given me a few months off from kidney scans, 24 hour urine tests, and urinanalysis. Of course, if I develop any symptoms...I .
If it is not one thing, it is something else.