After going through your history it seems you suffered a Upper respiratory tract
infection and Throat infection
) treated by antibiotics. But cough with brown sputum indicates there is some aspiration in lungs and may have caused small Pneumonia/Bronchitis
It is advisable to see a Physician and after examination if justified a X Ray may be done and simultaneously sputum may be given for anlysis and Culture.
depending on finding treatment (Anti biotics) may be required.
Symptomtomatic therapy may be given to reduce cough and clear the chest.
One should keep in mind why lymph glands are still enlarged?
May with treatmet you will be al right soon
Best of luck.