Okay, I was suspected of having this in 2017 but it was never confirmed. Me going downhill so fast in last 6 months as in physically and o2 levels randomly dropping is not supported by my most recent pft. I did have hrct done which was normal, but I don't think it was done in expiratory phase to rule it out. Dr. Mannino, how else could this condition be ruled out? My concern is due to having used ecigs for 3 years and working/breathing in chemicals for 34 years. I am just trying to find out where I really stand with my health. I am having heart testing done, but do not think it is that. My breathing is constantly restricted, constant air trapping feeling in chest and o2 dropping even at rest. These symptoms are not supported by my mild copd at all. Any feedback would be much appreciated. Thank you