Regarding your nocturnal oxygen saturation levels, have you ever consulted a board certified sleep medicine physician (Neurologist, ENT or Pulmonologist) in order to get a sleep study done to rule out obstructive sleep apnea? Of note, the attended sleep studies where you spend the night in a sleep lab are far superior to "at home" testing, but of course insurance companies balk at paying for them. Wishing you all the very best!