Hello. I m an avid runner, but in the past 4 or 5 years I ve developed a strange condition. While running usually 2 or 3 minutes into the run I will get a strange sensation in my stomach chest region, sort of like a gurgling. Then my arms will go dead then my legs and my breathing is sort of labored. My entire run is then done at that point. BUT. It only happens once in 5 or 6 runs. I ve had 2 stress tests done on my heart and no problems.