From the symptoms which you have told it does not seems to be a regular cold.
you must get blood culture
done, chest x-ray, CBC with MP test to rule out bacterial infection of lungs ( Pneumonia
) and upper respiratory tract
and chest congestion is still present then you doctor WILL go for antibiotics.
Take good food, keep healthy life style ,avoid going in cold and polution, watch for fever and consult internal medicine doctor immidiately
Hope this helps