Hi, I Have Had A Cough For The Past Three

Hi, I have had a cough for the past three weeks or mopre and it becomes particularly bad at night. Its like I have fluff in my throat. Also had sore throat in the past few weeks but no infection eventhough the GP prescribed me anti biotics which I have now completed. my throat had not been sore it was more like pain but this has now leared but cough presisits