I used to smoke but quit four months ago. Recently, I visited a pulmonologist because I was having issues with coughing and feeling like I had to take deep breaths. The doctor diagnosed me with bronchitis and GERD and gave me some medicine. However, whenever I stop taking the medicine, my symptoms come back. Now I'm hearing a water-like noise on the left side of my stomach just below my chest. What could be causing these symptoms, and should I be concerned?