This sounds like gastroesophageal reflux disease (GERD). GERD is the back flow of stomach contents, including digestive juices, into the esophagus or food tube where it does not belong. This is most commonly called acid reflux or heartburn. Your symptoms could be caused by esophageal spasm from heartburn or vocal cord spasm from reflux. Please check with your doctor about this possibility. This reflux can come all the way up into the mouth and nose. When this happens the material can be aspirated, dribbling into the windpipe and lungs. This could explain your symptoms, including your shortness of breath. GERD can cause the following symptoms:
· Heartburn or a sour taste in the mouth;
· Pain occurring in the middle of the chest;
· Coughing and/or choking while lying down;
· Increased trouble breathing while asleep; and
· Even no symptoms at all. This is called “silent reflux” and it is common.
Along with this there might be either bronchospasm or vocal cord spasm. The bronchospasm is a form of asthma called exercise-induced bronchospasm (EIB). However this could be angina pectoris, pain due to coronary artery disease that would not be identified by a Doppler study. You should have an exercise study with EKG monitoring and/or a stress echocardiogram. At that time your pulmonary function could also be measured and signs of asthma could be noted such as coughing or wheezing.