I have severe obstructive sleep apnea -- am 6ft and 210. I wear a CPAP and now swear by it. A couple things to help those who try: 1) Make sure you have a CPAP machine with a water tank so the forced air is moist. For me, if the water runs out, that's when I wake up bc my nose dries. 2) Get a spray saline solution for your nose -- not Afrin or drugs (habit inducing) -- just simple and cheap Arm & Hammer Simply Saline…
Have you tried losing weight and if so, did that help?
I know it's an N of one, but it shows it can help and is worth a shot. Even if it doesn't completely resolve the sleep apnea, there are so many other additional benefits.
After an alert from my Apple Watch and a few extremely rough nights of sleep when my weight hit an all time high, I scheduled a sleep study for myself. It's 2-3 months out still, so I plan to lose what I can while I wait to see how much it can help. Even the first 10 lbs was a significant help and stopped the truly awful sleep I had for a week or two.