<s>[INST]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?[/INST]Hi. You have not mentioned your country and your age and weight. You have not mentioned the findings of chest x-ray and ultrasound abdomen. You may be a case of tuberculosis of chest. For diagnosis of tuberculosis of chest, u require CBC with ESR, sputum AFB, CXR etc. If u do not have abdominal complaints, then go for CT chest first only. If CT chest out to be negative, then u can go for other investigations.  If u have any other query then ask. Take care.</s>