So two days ago I was at my in-laws' house, and my kid was messing with my mother-in-law's pulse oximeter. To show him how it worked I put it on my finger, and it read 96. I was like, hmmm, this thing is broken. So I tested it on my son and my mother-in-law. Both 99. WTF? I had just had a covid booster the day before, and all day I felt like dogshit all day, and then the next day (yesterday) I felt like I was having asthma all day. Couldn't take a deep breath without coughing, etc. That doesn't appear to be one of the known side-effects of the Pfizer vaccine, but I wonder if I discovered a new one. Anyway, I have a new found appreciation for you and others who have been struggling with long term low oxygen. I was struggling after 2 days! Feel better today, but I'm definitely going to remeasure to make sure there's nothing there anymore.