I have been diving for 30 plus years. I was diagnosed with severe restrictive sleep apnea about 10 years ago. From the questions my E.N.T. doctor asked me I figure I have had it for well over 20 years.
I use a CPAP, and it has made a huge difference in my life. I was on blood pressure meds for quite a few years before I was diagnosed, and soon after starting on the CPAP I was off all meds.
I used to be constantly fatigued, and would often sleep on night dives. It's amazing what you can learn to do.
You would be surprised how many people use CPAPs. I have been to a lot of places all over the Caribbean. Even places where the customs/security people do not speak English. I used to carry the paperwork for my CPAP just incase they questioned me, but in all cases they knew what it was.
I average over 100 dives a year without any problems.
But, as others have said, CONSULT YOUR DOCTOR.
A good tip for those that travel with CPAPs. My old machine was a little bigger than a shoe box, and weighed a ton. I now have a machine half the size, and light as can be. I spoke with my doctor, and explained the problem to him. He prescribed a machine with a humidifier. (I live in south Florida, and do not need humidity, but it did come in handy in Vegas at DEMA.) The machine detaches from the humidifier making it really small. This really helps when traveling with weight restrictions.
Just my $0.02.