Hi Zora
You have so much going on right now, I'm not surprised it's a struggle to get everything done. I can say that yes, it DOES get easier for most people to sleep with the mask on. Plus, as a veteran of over a dozen surgeries, I can absolutely say with surety that that knocks the hell out of you. Between the extra healing you need to do (which needs more sleep) plus any discomfort, stress, worry, anxiety, depression etc that potentially comes with an illness, and the effects of the medications used during and after the surgery, that's bound to make you tired even without the disruption of waking up with the CPAP.
Is there anything in particular about CPAP that is keeping you awake after those first few hours? I know that you don't have the spare spoons to deal with OSCAR right now, but if there's anything specific, do let us know so we can try to help.
You don't say if you've started new medication, hormonal treatments, etc, but obviously, those can also affect your sleep a lot, and I imagine that it's probably a big mix of things making it harder to feel rested. Someone recommended a CBT-i app a while back that is free, so if you think that might help you get back to sleep, you can try that here:
https://mobile.va.gov/app/cbt-i-coach
Regardless, sending you good thoughts. Take your time and be gentle to yourself.