What Could Cause Feeling Of Something Stuck In Throat After Having Cold?

had a cold which cleared in normal seven days but so many months later feel something like light mucus on the throat and have no urge to cough at some times i feel like clearing throat when cold- the throat does not pain, most times i feel it driping down the throat so i swallow it which irritates the stomach sometimes - what could be the cause, which medicineshould i take, am 38 an 70kg