You can have them do a test where they put a tube down your nose into the throat for 24 hours.
It will show if reflux is causing your cough. If so, find the best bariatric sugeon that you can find and ask for a loose Nissen.
This is what my dr. did for me and it has made all the difference in the world. I was waking up at night 2 or 3 times and had to get up until I coughed all the flem up. I was coughing very hard and it finally caused my blood pressure to go up.
I would recommend the Nissen to anyone who is having the same problem. I had loads of tests and took meds for the relux but it didn't help. I also was sent to a lung dr. to be checked out before they did the Nissen.