Hey Avis, yes you and I are in the same medical situation. I’ve been treated for ten years now, but it’s been somewhat of a maintenance effort. I have a pulmonologist who has monitored my sleep thru 3 sleep studies, and 3 different cpap machines. My cardiologist has me taking Metropole 150 mgs (beta blocker) nightly, to stop the heart from excessive pounding and excessive pressure from the adrenaline rushes. I take a 100 mg Losartan BP tablet each morning all to maintain a stable low BP number during the day. Yes, I too just stop breathing 3-4 hours into sleeping, and am awakened by the adrenaline rush. But it’s been somewhat better in the past year, as I’ve added deep full breathing exercising for 10-15 minutes before going to sleep, and also just after forced waking from the mid sleep adrenaline rush. This puts my oxy percent back up to 98 or 99 % and I can feel an immediate warmth as the highly oxygenated blood hits my fingers and toes almost immediately. It is so important to get your cardiologist on board with your situation. The 150 mg Metropole does help in keeping the heart from excessive racing, but I’ve got heart problems resulting from this breathing/ oxy loss problem after 10 years of this problem. The cpap does help, but does not come close to keep me fully breathing without stopping. My chest/rib muscles that are responsible for automatic breathing while I sleep, just don’t work or the nerves don’t prompt the muscles to fully work. See if you can get a cancelled appointment to get on this problem earlier than your current appointment. Keep in touch thru this site as I will too, sharing medical info to challenge the doctors but find a specific solution to our shared problem. God bless your efforts to find the right answers. CV ///