WELCOME! to the forum.!
I wish you much success as you start your CPAP therapy.
Hang in there for more responses to your post and feel free to ask as many questions as you need to, to help you along on your sleep apnea journey.
Welcome! 113 AHI is pretty impressive, I hope you quickly start to feel better.
Great numbers - congratulations! Some people have an instant sensation of zest and vigour, but for most of us it's a bit of a journey. The apnea has probably been doing cumulative damage over a long period of time, so it might take a little while to reverse it.
The mask is the single hardest things to get right. Every face is different and people have so many personal preferences and idiosyncrasies that it's very difficult to get one that suits perfectly. Really the only advice I can offer is to keep trying till you get one you like. You can also use mask liners (Pad-a-cheek or Remzz) to help control leaks and any facial irritations. Generally over-tightening the straps is counter-productive as it distorts the mask seal and can also cause headaches.
For what it's worth the Fisher & Paykel Simplus seems to be the most popular full face mask (I use one) and the Resmed P10 is the most popular nasal pillows.
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I use the F&P Eson nasal mask which has a very similar seal to their Simplus FFM (which I also have but have not opened yet). The Eson seals very, very well for me and the straps can be left quite loose.
x 2 on the F&P Simplus, I had 5 others in 6 months that all leaked badly, now I get an occasional leak but no big enough to be bothered with.