Dear the way you have explained and greenish colou of exudates shows bacterial infection. Excess use of antihistaminics also makes the exudates thick. As a rule in cough when there is expectoration use the medicines which help expectorate and clear the passage and when it is dry cough
in your case have steam with euclyptus oil or but adding cap karvol
to boling water. have sitopladi churan 500mg in one tea spoon of honey mix it and lick it and have hot water after it. Avoid cold
thiings.Have sy. Crux 2 tsf tds kaph ketu ras with hot water and kanth sudharak to be sucked.