Hi new to this board. My story started in 2012 when I thought I was having a heart attack with palpitation and chest pains. I Went to the ER and ended up staying for several days of testing just to be told my blood pressure was high. The attack happened again a month later but this time I also had severe heart burn and was sent home again after several days of testing. No diagnosis except for high blood pressure. Because of the heart burn I went to a GI Doctor who did a endoscopy and I was diagnosed with Barreits Esophagus with high grade dysplasia and a hiatal hernia. I had 5 ablations and the hernia fixed. It took several years but during this time i kept having these attacks that would last between 30 minutes and an hour. In Dec. 2017 I had another attack but it lasted for five hours,the EMT came while I was still having the attack and found I had a heart rate of 280 beats a minute. The Doctor diagnose me with SVT (a form of afib) In Feb of 2018 I had an ablation of the heart to fix the problem. (So it took 5 years to get diagnosed with SVT because by the time I went to the ER I was out of the attack and heart back to normal. The last attack lasted so long they finally caught it.) Soon after I started to have SOB and went to the pulmonary Doctor and after numerous test i was first diagnose with servere sleep apnea and then place on a CPAP with supplemental oxegen. I also had performed the methacholine challenge and tested positive for asthma. I was put on 2 daily inhalers that helped. How ever in the last sevral months the SOB got worse and I was sent for a pulmonary function test witch showed my breathing better than the last test.The Doctor than sent me for a CPET test that showed my heart and lungs were good but my ABG at rest prior to the test showed a Pa02 of 61 and a Sa02 of 91. and the Ve/Vco2 slope suggests that I have Excessive Dynamic Airway Collapse. (EDAC) The Doctor believes this is what cause my SOB. I am awaiting a bronchoscope to confirm this. If this is what I have the Doctor talked about having stents put into my bronchial tube. EDAC could be the cause of some of your SOB symptoms