I'm not a medical doctor, but sharing my experience. I have been battling extreme fatigue for about the last 10 years and have tried everything to get to the root of the problem. This resulted in my body having blood problems and ongoing worsening blood results, fearing leukemia or polycythemia. I've been to cancer specialists, TRT specialists, sleep specialists, natural medicine, you name it. Turns out my body had very low oxygen, and regardless of every single supplement or treatment I tried, the low oxygen was the culprit. I struggled very much with CPAP and gave up, but after worsening blood test results again and the ongoing fear of polycythemia and leukemia in my blood tests, I am back to dedicating to making CPAP work. This time though the difference was in me finding the right mask that I can stick with. So, for those seriously struggling, I highly recommend if you have been diagnosed with sleep apnea and are struggling with CPAP, I highly recommend to require your provider to have you try multiple masks until you find the one that truly works for you. Originally, I was only given one mask with the machine and I think that is a major letdown in the medical field. When you go in for a mask fitting, I'd just tell them outright you want to try one of each mask, do not put up with them only giving you one mask to "try" (so full face mask, mouth and nasal pillow mask, and nasal pillow only mask at least). Try them each for a week at least and see what works best. Keep trying different masks until you find the right one.