Suggest Treatment For Severe Cough With Chest Congestion

Question: Hello, I caught a "cold" in the first week of September. Chest congestion and coughing with no production or very little. Cannot cough up a sample to see what it looks like. Coughed so much I had to wrap my ribs.
Went to Urgent care facility (in October) and was prescribed a z-pac which has never worked in the past. Told ribs were sore due to continuous coughing. If the z-pac didnt cure it then it was viral and it would have to go away on itsown? It ins now November, coughing has eased, ribs are better but cannot sleep on my side yet. I still have congestion in the chest especially in the a.m. and random coughing spells. Some days I have no symptoms at all. Recently I tried to purposely cough (multiple times) to try to expell the congestion
and it seemed my lungs became "clouded/fogged" with congestion so bad and I could not catch a full breath. That symptom disappeard after about 1/2 hour and was back to the normal congested state. I had possible exposure to mold due to a basement flood but have lived in the house for the last 14 yrs without any issues. We have performed mold tests w/o any concerning indications. Thank you for any advise or information you may provide.