I suffer from COPD, it takes my breath away, yet my oxygen level always remains in the 90 to 100 range. The attacks hit at different times; sometimes while I am walking from the bathroom to my bedroom some 5 feet, taking baths or showers, using the bathroom, getting in and out of bed. Doctors are puzzled.

I feel sometimes deep contractions in lung, actually I can't determine its location but it lasts for several minutes and then disappears as if it never happened. It was in one region until today I felt it in my chest, deep contractions that for a while I felt I can't breathe. I am not allergic, and I have no type of allergy and am not smoker or obese or alcoholic, I wonder what it could be.