Fever for more than 2 months. The same.

Hello Doctor, I m having fever for more than 2 months and nothing has been diagnosed to be positive. Underwent the diagnosis such as typhoid, malaria, dengue, all blood counts, montoux test, blood cultures, ANA. Awaiting DSDNA test result. Also underwent chest x ray and abdominal scan. There is a slight fatty liver with 13.4cms which I was told is not a problem. The fever normally ranges between 99.6 to 100.4. At times it's going until 103 in case if I am getting tired. For example yesterday I had to go out on a two wheeler and got bit tired. This morning the temperature has reached 102.8. If I am at home with complete rest the temperatures are almost normal below 100. Kindly help and advice. Please let me know for any further information on the same. Regards, Satish