Hello
Since you are having persistent cough with difficult breathing.
Such type of symptoms may be due to these reasons, these include.
1 Asthmatic allergic
bronchitis , some allergen produces
bronchoconstriction and this causes dry hacking cough . Cough increase in the night due to fall of temperature . Predisposing factors are dust , mite, pollen, mold, sudden increase or decrease in temperature , fumes ,
smoking ( active and passive ).
When such patient visit I advise my patient t to take montelukast+bambuterol tablet once or twice in day till complete relief.
Hot coffee and steam inhalation also provide relief.
Codeine with chlorampheniramine maleat cough syrup also help. But this causes addiction.
Since this is a prescription drug so consult your doctor and get his prescription.
2 The next reason of such cough may be due to
tuberculosis , since this cough is for 7 months . So get in X ray chest with blood for E S R and if sputum for AFB.
3 Cancer in lungs , since period is prolong . So get in MRI for confirmation.
In my opinion consult a chest & tuberculosis specialist and get his opinion.