My AHI was 115 when I was first diagnosed. I went in for a sleep study because my brain had become mush: I couldn't focus, I couldn't remember things like I used to, etc. I slept all the time and still felt tired.
Did you have any of the memory / focus / concentration problems? Did they get cured once you started CPAP?
I've been using my CPAP machine regularly since around 2012, and, sadly, a lot of the initial symptoms I went in for have not gotten better. I still can't focus very well, I still can't remember things like I used to, etc., even though my AHI number now is usually 1 - 3. I'm still pretty much tired all the time as well. I wonder if I seriously damaged some portions of the brain while I went untreated 
I hope that someday I will regain the brain I once had, but it doesn't seem like it......
I haven't had a sleep study in a couple of years now; maybe I should have one done again to see if my machine needs to be recalibrated or something.
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