I have been spiking a fever off 103 or higher off and on daily for over a week, I don't have any other symptoms except a headache with the fever and low energy. no body aches, no vomiting so I don't believe its the flu. im drinking lots of Gatorade, juice and water. when I first starting getting sick I had a lot of back pain but ive had 3 back surgeries so that can be typical . just in case it was kidneys or bladder I was drinking cranberry juice and Gatorade but there is no back pain now only high fever, Which can be controlled with advil and lots of fluids. any idea ??