Oh the woes of doctors. Coughing from my non medical understanding is caused by usually an irritant; smell, something inhaled etc.. Are you possibly now allergic or just sensitive to something in your daily life that has been there constantly? Could it be you are sensitive to the smell of one of your personal hygiene items; shampoo, D.O., make up, lotion etc... Food, something you eat or drink could be causing this to happen. A pet? Our bodies are weakened by this disease we share, the immune system tires causing us more havoc then we wish. I would hope that your doctor would have at least set you on a path to check some of this out and give you something to ease the coughing somehow until a cause for it could be found, just this one persons thought of course. If you are not happy with how your current doctor is helping or not helping you, yes you have every right to seek out a new doctor or at least a 2nd opinion. Please always advocate for yourself, ask direct questions and expect a direct answer, no answer then ask again. Please keep us posted on what is happening, you are not alone in this battle..