I have had cold symptoms for the past week (cough, sore throat, runny nose, etc.) While I thought I had been getting better, I still have the cough that now sometimes leads to a hacking cough that ends in dry heaves and retching. Often the dry heaves/retching occur seemingly out of nowhere. I do not feel nauseous at all, but my sinuses are draining. is there something i can take to suppress the cough/retching or should i go and see my doctor?