I could not tolerate CPAP machine because I hated the tubes, I travel a lot, and I constantly worried about getting distilled water, cleaning the hoses and nose pillows and changing the filter. I also developed an eye problem and wondered if it was caused by the pressure.
I slept face down for a while and that seemed to help a lot.
Now I am sleeping on my back and sides with strong neck support and a lower head to encourage an open airway. There are pillows you can buy for this. Seems to help in a non invasive way.