This has happened to me in the past with echocardiogram, arterial blood gas test and pulmonary function test coming back normal. At the time the only thing they could point out as cause was a recent bronchoscopy that might have left leftover lavage fluid.
Now, a year later, after being on nexium almost 12 months, the pain/anxiety came back while walking. The only thing that has changed in the last week or so is that I had discontinued Nexium (40mg/1x/day) and had about 3-4 fast food meals which I know gave me reflux but not on the day of the chest pain, this happened on pretty much an empty stomach in the morning.
When this happened I had no troubled or labored breathing or panting, just the chest discomfort that suddenly appeared along with the anxiety that followed.
I had been doi(ng strenuous exercise and salsa dancing a couple months ago so I cannot see how the only factor (GERD comeback) that has changed this past couple weeks could be a factor in this, wouldnt it cause the pain and the anxiety also at rest if it was the GERD?