Well that was odd. Had a fight with the mask as I couldn't get it to seal properly at first (the machine tells you how good the seal is, you need 3 out of 5 for it to work properly). I definitely feel more rested today, not full of energy but definitely better than yesterday. Lets see if two days makes it even better.
Roughly speaking, you need one hour of sleep for every two hours you are awake (That's based on you needing 8 hours sleep a night) you have hormones which remember how much sleep you have had and they are pretty accurate too.
So to make up for all those hours of sleep you haven't had as well as all those hours awake when you could have been asleep, it will take a long time to catch up.
What can happen, when you've paid off a lot of your sleep debt and you feel more awake, is that getting to sleep may become more difficult. Our brains are more wired for being awake than asleep. You feel bad because you are in servere need of sleep. You'll also be well conditioned to having a high sleep debt and will be less sensitive to the effects.
You might well come to a stage when you feel that your CPAP machine is a hindrance to your sleep, because as you pay off your sleep debt, you could start to become a lighter sleeper and more aware of your CPAP machine whe you are rying to sleep.
If that happens, then I think that you should perservere with the CPAP and try and get used to it.
At the moment, I think that you are so zonked out and in need of sleep that any discomfrt caused by the mask is vastly outweighed by your need for sleep. So it should at the very least, give you some relief and make you feel better.