I have been having intermittent low grade fever for about two months. I m also having rib pain, headaches, breathlessness, night sweats, swollen face and sometimes hands, intermittently very bad fatigue, some joint pain. I have tested negative for all autoimmune markets, Lyme, ect. Everything seems fine. Blood cultures have also not shown a thing. Dr does not know what it is and has ordered a CAT scan with contrast of chest, abdominal and pelvic areas. I am very nervous. Any ideas of what it may be or what else to check for?