I was treated for a bladder infection about 3+ weeks ago with a 3 day course of Bactrim. 2 days after I stopped the Bactrim, I developed high fever, all over pain, low back pain, and chills. Went to the ER was treated for kidney infection (even though culture was negative) with a 12 day course of cipro. Finished the cipro 5 days ago and now having burning with urination, low back discomfort. Felt better a few days ago. Had ultrasound yesterday. No results yet. I am a 46 yo female. 5' 1", 106 lbs, otherwise good health