Difficulty in breathing. It's a gerd!

Almost 1.5 years before I was having severe cough so I went to normal physician. He gave me some cough syrup and after medicines are over the coughing started again. Then I went to ENT but that too did not help. And after sometime I started feeling difficult to breathe it's so severe that every night when I sleep I feel like I will die today. Then I went to pulmonologist he gave some medicine but he was not entertaining me properly at time of consultation and he was not able to figure out what is the issue. And he told me that if you still have this issue after medication we will have test for asthma. But because of bad experience with his consultation I did not went to him again. So can anyone tell me what maybe the issue is am having transparent cough. Sometime I feel burning sensation in chest at lower part. Difficulty in breathing occurs mostly when my body gets dehydrated. I suspect it's a GERD