Burning Throat, Vomiting. Problem?

Hi, since several months I am having dry cough. However, there is a peculiar trend. Coughing is more after I eat food and even more if I am in AC environment. During monsoon it increases. However as it's winter now there is reduction in coughing. Another problem has started now, burning sensation in throat. I took AZEE (Azithromycin) dose for 3 days but no relief. It was one month and no recovery. Later I went to ENT specialist. He diagnosed me with Granular pharyngitis due to hyperacidity. I took antacids but effect was temporary. I am taking digene tablet when acidity increases. In office suddenly I get coughing, deep breathing, vomiting sensations. Digene helps temporarily. Am I having GERD? What is the cure for my throat problem? It's especially high in morning probably coz throat is dry after waking up. It also increases as night comes up. I am unable to eat any chilly food.