Fluid in my chest?

Patient: I am a life-long asthmatic, but have not had issues most of my life to to me being very active. I have noticed that since i have started my new job about a year ago, I am getting more and more winded, coughing persistantly, and have the constant feeling of “fluid” in my chest that won’t never seems to go away. The building is rather old, abd could possibly have mold in it. I have seen a doctor once after I coughed so hard that I fractured 2 ribs, and torew a muscle, but theycould not find the reason, and attributed it to asthma, and possibly pneumonia. I was treated for both, only to have the same symptoms return. Any thoughts?