I've had a low-grade Fever of Unknown origin for 7 weeks as I write this, with extreme exhaustion. I have been through extensive testing and had many things ruled out, like Mono, Lyme, UTIs, tumors. I've had CT Scan of abdominal area, Blood Cultures, Urine cultures, Chest X-ray. I tried a week of Cipro as I was sure I had a UTI (my fever started the day after sex), and my pain went away but my fever and fatigue remain.
I am seeing an Infectious Disease Doctor in 4 weeks.