I am a 27 year old male. I am suffering from cough and cold from past 7 days. No fever but lots of cough. I have taken medicine once Doxy100 and one calpol and today I took one taxim o. Now the cough which is slowly coming out is black in color and I feel my chest is filled up with cough. Cold does not comes out of my nose due to sinus. Please assist me on what medications should I take, I am taking karvol plus by inhaling but cough is not clearing through it.