Congrats on the keto diet.

It helped all those things for me too but did not eliminate the need for the cpap (actually my current machines are BIPAP's). I did cut my maximum pressure way down from what was needed when heavier, but I still have to use it. But I am pretty sure I had sleep apnia all the way back to when I was 14 years old. Only found out about it in my late 20's when I had a sleep study. And I was thin when in high school so my apnia was not completely caused by the weight gain.

Can't remember for sure what I weighed in high school but I think it was around 165. I'm at 175 now (6'2").