I did manage to find/see a doctor about 2.5 hours from me. I was able to get in relatively quickly to see him and as luck would have it, also was able to get another sleep study, this time as a bipap titration.
Oddly, as with my first titration, my numbers were very good. I was started at straight cpap at 5cm, then to bipap 8/4. Very few events were present, although even at 8/4 I did have aerophasia. Not too bad, but certainly not great.
I'm still waiting to get my bipap machine so I've done some more testing on my own with my current machine.
For the 30+ days I had my machine at apap 7-10 epr 3 and was around 8 ahi, but sometimes as high as 15. At least 75-80% showing as centrals.
With lower pressures, I do quite well for the first 2/3 of the night, then have a bunch of events (showing as centrals) for the last couple hours.
The odd exception was last week. I tried running at cpap 8 with epr 3, so effectively bipap at 8/5. I almost never drink but was quite drunk and my number for 8.5 hours of sleep was only .28! I've always thought drinking would make things much worse (certainly of obstructive events). Not sure what to make of this. I can't say I was rested since I was pretty hung over.
The sleep tech at my study told me I "didn't need much pressure", so knowing too much may cause centrals I've tried running 5cm. Last night was pretty good. For the first 5+ hours I have few events, then a whole bunch in the last couple hours and an ahi of 6.3.
I'm going to try staying at 5cm for a few more days to see what happens but I feel much better today so hopefully I'm on the road to relief.
I will update once I have the bipap for a bit.
Thanks again for all the help - Ed