What Causes Chronic Cough And Throat Congestion?

I would like to know what is light growth normal flora found in my sinuses. I started coughing severely after I got out of the hospital the cough lasted three weeks it felt like whooping cough I could not get any relief lying down nor sitting up I found out after three weeks I had a very rare bacteria and I should have been in the hospital. I was told that I got the bacteria from the hospital stay after I was in a car accident. The cough got better. I was on four different antibiotics Z-pack Augmentin, amoxicillin and Doxycycline. I started forcing myself to cough in the night and the morning because there was something in my throat choking me it was a clobb of yellow fluffy stuff that tasted a little salty it did not have the texture of mucus and it was not coming from my lungs. My lungs are completely clear. This has been happening since October 2017. I am not running a fever very often with this if I do it is usually around 99. I have been to four doctors about this I am not getting any answers to why this is happening.