Hello and thanks for the query
It seems like Viral fever
or Respiratory track infection to rule out Pneumonia
you must go for Chest X-ray but it doesn't seems to be?
Consult your doctor and take a complete course of antibiotic with some anti-allergic.
In addition to this take regular steam inhalation and try to expel out phlegm as much as possible if you can.
Protect your self from cold
weather and keep yourself warm with clothes.
Can take paracetamol
in fever, it also reduces your pain.