From last few weeks, I am suffering from dry cough. I feel like some cough got stuck in my throat. It causes itching due to which i have to cough to clean it. Whenever I clean it, after some time I feel like some cough got stuck again. Its happening frequently. Once I checked my cough, it contains some black solid particles(like dots). Most of the time I feel like some cough is there in lower part of my throat