As such acid reflux
doesnt happen because of nerve damage
, it happens because a the sphincter between your stomach and esophagus isnt functioning properly which is causing acid from your stomach to reach your esophagus. It is this which causes the burning and pain sensation that you have.
I believe the reason your doctor ordered an echocardiogram
was because he/she wanted to rule out any chances of the heart being involved.
I am sure you're doctor has prescribed you with a proton pump
inhibitor like omeprazole
as well given you advice on other lifestyle changes that will help you.
So rest assured, the the acid reflux is not because of any nerve problems.
I hope this helped answer your question.