I have a Wellue O2 ring that I have used some to monitor my breathing effectiveness while using the cpap. The first thing I noticed was how low my O2 levels have gotten day or night.
The O2 levels drop randomly into the low 80's. I took a nap yesterday for an hour and the O2 level was at 80 steady. I can confirm that may be accurate as it feels like I'm in an energizer bunny Ad and my battery died while walking across the yard. But I think I'm on the mend. Yesterday was the worst, today overall much better. And I just started taking some Mullein extract today. It take long for that stuff to start clearing out the lungs. I wish I had it sooner.