Thank you each and every one of you for your thoughtful responses. I wasn't expecting so much, and appreciate each of you coming to my aid. You've given me so much to think about.
Moriarty, thank you for your bluntness, and you are partially right, I did come in her hoping someone would tell me it's okay to stop - but I hadn't really made up my mind. It's just that for the last month I've been sleeping without the CPAP, blissfully falling into sleep on my stomach which is my most comfortable position. I've resisted going back on the CPAP, telling myself it was because of the heat, but now it's not hot anymore.
BTW I live in Switzerland, and no air conditioning, but we only have about 2 - 3 weeks of really hot weather.
As for taking the test on my back - they didn't give me any other options and I had a head full of electrodes plus others on my cheeks to test for jaw movement, etc. I couldn't really sleep on my side without risk of them coming off, or so I felt.
BabyDoc, thank you for the info on oxymeters, that's interesting. I've tested mine with other members of the family and theirs are always higher, between 97 and 99. So I figured mine was calibrated okay.
As many of you have suggested, I do need to talk with my doctor about this, especially about the lower oxygen during the day. I do breathe very shallowly, but that is partially because the muscles in my ribcage have been affected from radiation, so I tend to breathe with stomach movement, and very little rib movement. It is possible there is some lung damage also, so the suggestion to see a pneumonologist is a good one, and I will discuss that with my doctor. I will be seeing him (my GP) this week.
mjbearit, I have learned through the years to be proactive about my health, and normally would not have accepted the dismissal of my discussion that the sleepDoc presented, but I was not at my best at the time of the appointment. Brainfog, yes I know what that is.
PaulaO2, thank you for being so clear. I think I needed to hear that. My concern was about the oxygen levels, but the oxymeter also shows pulse rate incidents, and I have those too during the night. I was just hoping that maybe it was a positional thing and that would solve the problem.
I may ask to have a re-test with a different sleeping position and see if that factors in. Meanwhile I will be talking to my doctor and will give the CPAP another try.
I do have the ResMed S9 and it's a great machine, but I don't have access to the parameters, the sleepDoc did that. So any adjustments require that I see him. Since I was waking up every time it went past 11 or 12, he put the maximum at 11, but I haven't tried it since then as that was mid summer.
I tried a nasal mask and it kept waking me by pushing air out of my mouth instead of into my throat. So I now have a really nice mask just over the mouth and nose, but without a bridge thing at the forehead (caused headaches) but if I try to sleep on my side, it pushes the mask out of kilter.
Anyway, again, thank you all for the support and encouragement. While I was hoping to get some kind of affirmation that maybe I didn't need the CPAP, I think deep down what I was looking for was encouragement to continue with it.
Sometimes I just need a gentle shove in the right direction. And I do plan on having a long discussion with my GP about the oxygen levels.