Does anyone have suggestion on what could be causing my lung troubles?

I have been having trouble with my lungs for over four weeks now. When it first happened I thought it was congestion from a cold because it started with coughing and mucus. I didn't think anything of it but my coughing has gotten worse and I have boughs where I feel like I am trying to breathe through a straw and it seems like my lungs just won't expand. I got stuck downstairs in my truck the other night after shopping because I was coughing so hard it was making me vomit and I couldn't breathe. It literally feels like my lungs are in a box and can't expand. When I cough it does bring up a lot of mucus and it makes my chest burn. I don't smoke and no one smokes around me. I've never had a hard time getting up the stairs and now it feels like a marathon with my lungs. Could I still have a cold or is it past time to see a doctor?