@debkl Do you have a paralyzed diaphragm or was it something you were investigating that might have been causing symptoms you were experiencing? I'm not surprised your PCP hadn't heard of the sniff test. Did you have one to determine if you had a paralyzed diaphragm? There is an interesting discussion going on now in the facebook group with people who have paralyzed diaphragms. Most of us had x-rays dating back years or in my case decades indicating we had a raised lung but didn't display any symptoms of a paralyzed diaphragm, such as shortness of breath, lack of stamina, or extreme fatigue, until years later. An interesting explanation that makes sense but I have no idea if is true is that we didn't experience symptoms until our diaphragms became so atrophied from lack of use that our organs moved up into our chest cavities and compressed our lungs so that we couldn't breath normally. With my left paralyzed diaphragm, it's my stomach that had moved up; and for people with a right paralyzed diaphragm it is the liver that moves up and causes the problem. Interesting thought for the day. If you have a paralyzed diaphragm, I hope you have found a doctor who knows about it and can help you.