Shortness of breath whenever I lay down at night. I don't think I have heart failure since I have had multiple EKGs done in recent memory and have had no heart problems but I do think I have GERD ( gastroesophageal reflux disease ). I have experienced heartburn along with this shortness of breath which makes me think I might have GERD. I do have asthma although it has not been a problem since childhood, although people with asthma are very likely to have GERD. I do not experience any acid reflux though, so what could it be that I am experiencing?