I've had these kind of breathing issues for a few years now and I didn't have covid or get any of the shots. for the past month or so I feel like I can hear my heartbeat in my head. I get short of breath just moving around the house. I'm back on Cpap but I still take Sunosi 37.5mg to keep me from napping and to I have energy to do stuff than just sit. I have had many of the tests you've mention. it's a relief to just know I'm not the only one! so thanks for sharing. I can sit at the drs office or my chair and watch my 02 sats go down to 86% and then I seem to take a deep breath.