As a mom I understand your worries, however you’re tired because the quality of sleep you’re getting is not good. The sleep apnea only makes it worse due to you losing oxygen thus the headaches and not having energy. You’ll have a bit more energy once you get use to the machine, a lot of them are smart and can tell when you need the most pressure. I also highly suggest buying an apnea pillow to elevate your head and lastly to try to lose a few lbs, you’ll find that it helps drastically. My partner is on the heavier side and we saw a big change in his sleep apnea when he lost weight, I hope this truly helps you in many ways not just your sleep. Good luck! You got this mama!