hi I was having severe fever cough from past one
Thanks for the query.
The symptoms are more likely suggestive of post nasal drip which is quite common after a bout of fever. It can happen because the phlegm is accumulated in the sinuses and airway irritation is also there.
Generally it will settle by itself without any complications in ten to fourteen days.
As of now you can take NAC( N-acetyl cysteine) to clear mucus. Steam inhalation is also usurp clear mucus and open up the closed sinuses.
You can use codeine containing cough syrups to suppress the cough.
If symptoms persist you can consult a physician and plan for an X-ray. In that case you might require antibiotics like levoflox which is more specific for chest infection.
Wishing all the best.