Over the last month and half, i've been experiencing right flank pain, sometimes in the pelvic area. Over the weekend, the pain became very sharp and it radiated to the thigh. My thigh felt cramps and my leg was weak. In early may, I was diagnosed with uti and given antibiotics. I had pelvic pain, flank pain, dark, cloudy urine. The meds helped but subsequently the pain restarted. I have had an ultrasound but it revealed nothing, radiologist and doctor suspect kidney stones but none were seen on ultrasound. The pain sometimes is a dull ache which progresses to the sharp stabbing pain. Please help!