Here is my story - I am a very active 41 year old woman who does strenuous exercises 5-6 times a week, but lately I have been having severe shortness of breath (cannot even climb a flight of stairs without stopping) palpitations and fatigue. I had a pacemaker put in last year for extreme bradycardia and shortness of breath. I have recently gone for pulmonary function test, lab work, echo which all came back normal. I had a MIBI stress test last week (do not have results yet) and that night started with an extreme tight cough which has gotten much worse. I am now fighting to breathe and have been put on Prednisone, antibiotic, Zopinex, and Tussionex. Important note was that the MIBI did show that I have extreme chronotropic incompetence (heart rate never went above 114 even though I was working my butt off). They have also been playing with my pacemaker trying to increase the rate response - however I am not even getting anywhere near the level they keep upping it to. I do have a history of asthma, but again the pulmonary function test all came back normal - the meds they just put me on were from a flare ? from the MIBI. The shortness of breath and palps and fatigue have been getting worse for the past few months. I really need some advice on where to go from here. Anyone????