Have you found any way to manage it at all? After doctor tests kept coming back normal, I became convinced that it wasn't caused by anything serious that something about my breathing was just off, but I didn't know how or why. So that's when I started focusing on managing it, while at the same time trying to find answers.

If you get a chance, look up "Buteyko Breathing Method", which is the method that has greatly reduced my symptoms (and even made the whole issue go away for a couple of years), and I still manage the issue by doing breathing exercises occasionally.

The first few days back in 2012 when I first discovered this breathing method, I only breathed through my nose and resisted the urge to take a deep breath as much as possible, which was difficult no doubt, but after about 3 days, the air hunger pretty much disappeared. So there may be something off that breath control helps to get back in sync.