Oh yeah, I can tell you all about being angry. Also depressed, frustrated, filled with despair, etc.
The source of my anger was that none of my doctors considered testing me for OSA sooner. Hmm, if
I was the doctor and a (then) 22- (now almost) 27-year old, otherwise healthy woman came to me complaining about being tired all the time, I would have her tested for sleep apnea before I'd write her problem off as "depression" and test a series of antidepressants on her.
I'm angry because I feel like I've been treated like a lab rat, first by a series of GPs, then a psychiatrist who never listened to me, even though I always said "I don't really feel depressed, just so tired. I'd be in a better mood if I wasn't always so tired."
I agree with the person who said that many of your other medical problems are probably caused by sleep apnea. I'm finally getting my CPAP next week and I'm betting that the treatment will help with my so-called "depressive" symptoms. At the very least, even if your other medical conditions aren't caused by OSA, it isn't helping them either, so getting your treatment optimized should at least help, even a little.
And as for dating, same here. I haven't been on a date in ages because I'm just too tired to try and have any kind of social life. And explaining about the CPAP? Not really looking forward to that either.

I feel your pain.
But as for being angry, you have every right to feel that way. Have you thought about writing in a journal? It's a nice opportunity to vent all the anger and get it out of your system. No one ever has to see it but you, so if you're really mad at someone, you can just write about it, and no one's feelings get hurt. It can also be helpful for keeping track of symptoms, so you have some kind of record when you go to dr's appts, etc.
Hang in there!