I've had a persistent cough for 2 months. I've constantly brought up phlegm. I've had a chest xray and my lungs are clear, I've been to a ENT, and he said there's no drainage coming from my nose. I've been on 2 antibiotics in the beginning, 1 was the ZPack, and 1 was Bactrim Twice a day for 10 days. Nothing has helped. I've been taking Tesslon Perles , and an over the counter cough suppressant, but that doesn't stop the cough, or the yellow mucus I'm coughing up constantly. I'm wheezing constantly which I feel in the back of my throat, and I get dizzy sometimes. Where is the mucus coming from, if it's not my lungs or my nose. I also take medication for Gerd which I've been taking probably for over 10 years. What can be going on? I obviously have some infection since the mucus is yellow, but why doesn't any cough suppressant work. I'm really at my wits end. Please advise.