Hello dhosmer87 , i have gone through your case scenario and symptoms that you are suffering at night are inclined towards a heart cause , though you need not panic as of now and take the medication as prescribed for your acid reflux
as it is notoriously known to mimic cardiac symptoms .
My advice to you would be to get an Echocardiography
with doppler study to see your cardiac chambers and valve status at the earliest . Hope i have been able to help you with your doubts . Take care