I Had The Flu 2 Weekends Ago. He Gave Me

I had the flu 2 weekends ago. He gave me antibiotics & codeine for cough. I now have a mild dry cough with a little watery throat & some brown watery liquid coming from my nose for a few days already. Not much comes out but maybe 3 x a day. I had chest pain yesterday & fatigue. Should I go see a doctor?