Hi ive had a cough for about 2 week.but the last two days its been really bad..I cough first thing in the morning and bring up phlegm of my chest but the rest of the day I just cough and get alot of saliva in my mouth get pain in my throat and sensation in my throat which makes me cough more. sometimes coughing fits.ive been to the doctors and he said my chest is clear and if the coughs bad use cough remedies ..so I have tried all different ones and nothink seems to work..im worried its somethink serious.because I get alot of saliva in my mouth then have to swollow it..can you help..