Glad you are feeling so much better
I too, had much the same story, up 3 or 4 times a night and sleepy through the day
this CPAP machine is truly life changing, but my AHI is nowhere near 0,I'm lucky if it gets below 4
but I'm still adjusting machine,so am hopeful of reaching that one day

I only started using a CPAP 4 weeks ago and am truly amazed at the difference it has made I no longer get up 3 times during the night for a loo break,(which I now realise was prob sleep apnoea) nor do I feel like I need a 'nanny nap' during the day I am still working out how to use the software,but ...