mild fever

i getting a mild fever from last 15 days that means than normal temperature but not so high it only some fever than normal body temperature i go to doctor he said it normal fever & comes due to atmosphere changes but is from last 15 days
an it occurs every year one or two times,i contacted doctor every time and taken test of blood,urine,x-ray of chest but noting is incorrect but after some days with or without medicine it goes but there is no fixed time,during this time i became very weak and all ways feel tired,
please help
  

[harrald]

Fever is an indication that there is some inflammation  in your body. Of course, if you have an infection, your temperature would be high and not mild. You have been tested for the major causes of illnesses that produce temperature changes. Have you tried a simple experiment on yourself using aspirin to lower a temperature? This is only a suggestion:  use a regular aspirin two or three times a day for several days and monitor your temperature. If you do try this suggestion, follow each aspirin with a glass of liquid whether water, juice, milk to ensure your stomach does not get upset.

Harrald