Dear NJH, between breathing problems, frozen diaphrams and Covid 19 its been a really difficult couple of years for a lot of people.,,you and I included. I recogniize all your issues but don't recognize the term Atelectasis. I was on oxygen for about a year (24 hours a day). I have an appt. in August to see where I stand with my lungs. I exercise A LOT and, like you, use Ventolin on a regular basis, seem to have a little asthma and COPD that compound the breathing problems. Sleep with a fan a night. Now, I have a lot of nerve problems. When my diaphram stopped working on my left side after biopsies and lobe removal surgery, the Pulmonary said that this is usually the affect of a nicked phrenic nerve. This type of damage usually resolves itself, if it is going to, within a year. It didn't but l I feel better these day (a lot better and I hope you do too) I am trying to resolve the nerve issues or at least get a solid diagnosis. Every doctor I have seen for the nerves want to blame it on a different type of nueropathy, I am a T2 diabetic but the nerve problems, the supposed Raynaud's, and carpal tunnel have all been blamed on that but it all started with the surgery. Keep your chin up. Covid-19 taught our doctors a lot of new stuff about our lungs.