hi welcome to HCM
hi i had gone through your query and understand your concerns. i would come up with two most possibilities to fit your condition .these include
1.the first possible cause may be TUBERCULOSIS;chest x-ray and sputum examination may confirm the diagnosis
2.the second one include,ALLERGY;stress
,digestive inefficiencies,candida infection are the possible predisposing factors.
I hope this is helpful for you, thank you