Hi there, it sounds like you're going through a tough time with these episodes you're experiencing while trying to sleep. It's great that you've taken the initiative to monitor your oxygen levels and heart rate during these episodes, as that can provide valuable information for doctors to understand what's happening. It's understandable that you're feeling frustrated and desperate after receiving dismissive responses from doctors, but don't give up hope. It's possible that you have central apnea, even if you don't fit the typical patient profile. It may be worth seeking out a sleep specialist for further evaluation. In the meantime, try to practice "5 4 3 2 1 grounding" when you start to feel anxious or stressed after your night episodes; it may help you to reduce your anxiety. Remember that you are not alone, and there are people who care and want to help you.
