I have been experiencing rather severe pain in the abdomen, but with no diarrhea or nausea. The pain started during the night and was in the middle of my belly. By morning it was in my lower abdomen and very painful. It is painful to the touch. When I urinate there is pain at the end of the emptying, but not at the beginning. It is more of an ache than I have experienced with cystisis in the past. I have had chills and a low fever a couple of times.