hi i had gone through your query and understand your concerns. i would come up with the possibility of VIRAL FEVER
may be the cause for your sufferings.
-general poor health
-atmospheric changes from warm to cold
-allergic tendency are some possible causes.
it is spontaneously resolve within week, in this time paracetemol tablets are enough with plenty of water.
there is another possibility is, TUBERCULOSIS; kindly confirm with blood test
, mantoux test
,chest x-ray and sputum examination.
I hope this is helpful for you, thank you