I exercise a lot, running (when able) 10 to 15 miles a week among other things. For the past 1.5 to 2 years I have experienced periods (a week or so out of approximately every month until lately) of shorness of breath/exhaustion where I was not able to run/exercise normally. Mid 50's male in otherwise excellent health. Have seen my dr and a pulmonologist. Thallium stress test was negative as well as tests for asthma, chest x-ray, 24 hr holter monitor, ekg. I have had mvp for as long as I can remember but this is different. Had video scope of larynx and diagnosis was LPR. Started on antacid (omeprazole 40 mg) and voice therapy 2 months ago and after a few weeks saw some improvement. It had got so bad that I couldn't run a tenth of a mile without exhaustion, then the gradual improvement and I though I was on my way. However have had a relapse and am struggling to jog a tenth of a mile again. I would add that almost all of the tests done were durning "good" spells when I could exercise normally. Now it was been several months since I've run normally with only modest improvement for a week or so (about 2 weeks ago). What could this be that would come and go like that and know be somewhat consistent? The ENT is now thinking it may not be LPR.