Hello, I've Been Dealing With Persistent Nasal Congestion For About

Hello, I've been dealing with persistent nasal congestion for about three weeks. It started out with a while ago with heavy coughing and sneezing. I've been taking emergenc-E and its now reduced to mucus build up in nasal passage. Sometimes mucus drips down my throat. I am constantly blowing my nose or swallowing mucus. I am a bit concerned at this point. What should I do now?