I have all of the following test run. Each one came back normal.
Lung scan, methocolene challenge, bronchoscopy, heart scan, ekg, tilt test, echo cardiogram, stress test, ENG, sleep study, allergy skin test ( I was told I do not have any allergies and do not have the asthma I had been previously treated for when these episodes started approx 10 years ago and now become more frequent) I have played all the doctors games to make sure I wasn't missing anything. I was put on three different anti depressents ( at different times of course), anti anxiety meds, steroids, inhalers. I do have hypothyroidism but synthroid keeps my levels acceptable. I was walking up to seven miles a day but excercise is more difficult now though I keep trying.