Thank you for sharing. I am not on any drugs but I do have heart issues, which I have been told by my cardiologist should not affect my 02 levels. I supplement 02 at night (my idea because I grew tired of waking up gasping for breath a few times a night and a sleep study confirmed I do not have sleep apnea, but that my 02 did plummet several times a night) because I happen to have an oxygen concentrator on hand (belonged to my brother who died from COVID). My doctors (pulmonologist and cardiologist) are not concerned because legally I don't qualify for 02 supplementation since my levels are not consistently at 88 or below; but it seems to me it THEY were ME, they would be concerned about wildly fluctuating 02 levels if it were happening to them. I honestly don't know what else to do. I'm tired of worrying about it and no one seems to give a damn. Thanks for sharing and I am glad you figured your situation out.