Caren Toussaint answered question 11/8/2007 Low Grade Fever For About A Week, Lower Back Pain, Nausea, Diarrea, Very Tired, Sweats. What Could This Be? I am currently experiencing the same exact symptoms. I have a history of kidney stones, and am visiting the Urologist this morning. I was thinking that you may want to be screened for kidney stones also. In my past experiences with