Just noticed your post and wanted to say, Please get someone competent to test for fungal infections. I coughed for years, had to sleep sitting up in bed with a trash can between my legs so often because I would cough so much I would throw up. Nothing they did helped. In fact I tried to tell them many things made it worse, but they would not listen.
I had chronic histoplasmosis. This was so controversial that when his PA finally did a blood test to test for histo and it showed positive, my primary refused to treat me because I did not have Aids or HIV. I had been having retina bleeds due to ocular histoplasmosis for decades.
Long story short, it was a fungal cough. I apparently am very susceptible to fungus as I developed another cough a few years later and it was also a fungus. Sporanox and coq10 eliminated the cough totally after YEARS of hell!
I observe that fungus related coughs go undiagnosed because typically many primary doctors do not even know how to test for it, and in the case of histoplasmosis it can take weeks for it to incubate in the cultures.
In the meantime I would take some coq10 as this slowed down the coughing episodes a bit before we finally got the right treatment.
You need to have a thorough evaluation for your cough, a cough that is unlikely to be coming from stable pulmonary fibrosis. After 9 years of cough, your best bet is to contact the nearest university medical center and request an appointment with one of their cough clinic doctors. After 9 years a non-cough specialist is unlikely to be of assistance. Your cough could be strictly respiratory in origin or could be respiratory due to gastroesophageal reflux disease (GERD) also know as acid reflux.
Good luck.