Keep in mind the initial visit to the ER was because of kidney stone pain in the left kidney. I've had bouts with kidney stones several times in the past so I'm familiar with the pain. I believe the stone shifted before I was seen by the ER doctor because the acute kidney pain subsided. However, the urgency to urinate remained. That feeling remains nearly constant and has only been controlled somewhat by the Phenazopyridine. In the ER they drew blood and they took a urine sample. They only told me that they say some blood in the urine and at the time, no sign of infection. They only prescribed Vicoden for pain if the kidney stone moved again. Five days later I visited by PC and he took an XRay and say no sign of a stone still "on the move". I have no fever and other than the need to urinate I feel O.K. but it is VERY distracting.