Cold from yesterday, have some fever and headach

Patient: Hi, I have cold from yesterday. When i cough, it is feel very cold and headach. I was take benadryl as cough yesterday. I have been taken 3 doses from tomorrow evening. Is there any syrious problem. Please help me some medicine that make me some relax and help me in cough.

Symptoms: Coughing, headach, feel some fever

Doctor: