Following this thread, for the final report. VERY SIMILAR situation. I live at high elevation, so 88 on the oximeter is acceptable. Daytime #'s have always been 92-96.
6 weeks ago, viral cough dropped me to 88, 87, 86, continuing to 78. Tested negative for Covid, NO OTHER SYMPTOMS, just a cough. In the meantime, sleep study revealed need for CPAP. I was shocked. Recovery from viral cough came slowly, and numbers increased equally slowly. Here's the similar part: Now WILDLY fluctuating from 72-98.
I have already learned a LOT in this thread. Awaiting updates!