I have a throat infection for 7 years, but in recently from past 40 days I'm suffering from low fever with temp 98.6 to 98.9 ,99 f, and mild cough, and fatigue getting chills and body aches, I done for Covid test for three times negative, but my low grade fever and body pains and feeling back too much of heatand more heat feverish in the body ,, can you help me,its make fear,why it's causing me Worry,, what is it