I think headaches can be caused by low oxygen. At least in my case they can.
Hello all. Just happened by this forum via Google Search. Sleep Study & Diagnosed Severe Sleep Apnea 2003. Three years ago diagnosed w/COPD. Prescribed fulltime oxygen, 4lpm resting, 6lpm active. Present Equip is AirSense 10 Autoset, Socked heated tube, RespCARE Hybrid FFM, and SleepyHead software. Cheers, otrpu