On November 19, 2012, I began having a low grade fever. Tests showed I had a kidney stone in my left ureter, too big to pass. It was removed by laparoscopy on December 28, 2012. The doctor inserted a stent during the surgery and on January 2nd, the fever was back. I was hospitalized for 3 days with intravenous antibiotics. The fever continued. The stent was removed 3 weeks after the surgery. About a week after removal, the fever disappeared. Last week, around February 9, the fever came back on and off every 2-3 days. Went to the doctor and my left flank was sensitive. He said it was the area around the ureter and maybe there was inflamation or another stone. He ordered a Catscan. What do you think is happening?