I would be interested to hear the results of your reflux test. I am sure I have silent reflux, diagnosed with gastritis, was once told I could be in line for Barrets Oesophagus, was put on PPIs for years but then I went off them. About 18 months ago I had a barium swallow which said no evidence of reflux.

Also I am a huge producer of mucus with lots of coughing.