It sounds like your fatigue is more intense than mine was. The fatigue your dealing with sounds really challenging and I feel for you. That being said, I still wouldn't discount PMO as a major cause and for abstinence to possibly fix it. I suppose only time will tell if this is true or not. One thing you can't do is lose hope in recovering and use PMO as a way to cope. I say stay hopeful as it's still relatively early in your recovery.
As for a possible sleep disorder, I can't really offer any advice on what you should do there. What's helped me to fall asleep more consistently is to have a strict sleeping schedule and follow it no matter what. I wake up and sleep at the same time every day. When I do this I fall asleep quickly and get higher quality sleep. I'd recommend a book by Matthew Walker called Why We Sleep. There's a lot of good information about getting quality sleep in it.
I can't remember if I've read that book but I have read Sleep Smarter which talks about sleep hygiene and such. I'm pretty sure I know all the relevant information there is to know about sleep at this point. And none of it really seems to make too much of a difference as far as I can tell despite my best efforts. Which, of course, would make sense if I have untreated sleep apnea.
For the past couple weeks I've been having a really shitty time and feeling particularly fatigued and just like shit in general. I haven't even hardly exercised in the past two weeks. I woke up a couple days ago and my head just felt so heavy and my eyelids like they just wanted to remain closed... Sleep is very unrefreshing and I generally don't feel better at all until I get some kind of stimulant in me (caffeine and pseudoedphedrine from my Claritin D lol).
It's funny because for the past couple weeks I've slowly been rationalizing the way I feel as more likely than not being attributed to my sleep apnea. Due primarily to the severity of what I feel like I'm experiencing, and the fact that I don't see a lot of other guys talk about fatigue in this kind of context with porn. Sure I've seen guys talk about increased energy and even better sleep but I've never really seen anyone describe such a debilitating condition as what it seems like I experience on a regular basis. Thankfully I still manage to be functional enough to hold down a full-time job, but I feel like that's the most I can do.
And then I read this comment from you (Brutus) and you make me second guess myself once again lol. I feel like I'm slowly losing my mind lol; I just want to figure out why the fuck I feel like shit after I sleep and have no energy. That's literally all I want from life right now. And you actually think that porn could be responsible for this? I mean, I probably starting viewing sometime in my teens and maybe I watched it quite a bit when I was younger, but there would be times when I didn't watch at all (when I was in a relationship) so it was very on and off over the years, and most recently I had relegated it to only 1-3x/week on the weekends and for a short period of time at that. So I didn't really see my usage habits as out of control or problematic, and I wasn't viewing content that was making me feel guilt or shame or anything like that. Pretty vanilla shit.
But I mean, even still, you think it's possible that porn and dopamine dysfunction might be at the core of what I'm experiencing? I feel like this is rather unlikely especially when I know for a fact that I have untreated moderate sleep apnea, but who knows. Like you said, though, this probably isn't any reason to go back to it (porn). Even if sleep apnea is causing most or all of my problems, I know that I'm still better off without porn. In fact, it's probably because I've been abstaining from pmo for nearly 3 months now that I'm taking initiative once again to try and figure out how to treat my sleep apnea. So no pmo is definitely helping me, even if it's in an indirect manner. I had put my sleep apnea on the back burner for a couple years for a variety of reasons, but mainly because the next steps feel daunting and also money is an issue. I started looking for other ways to explain or improve my symptoms, including diet and exercise, and even pmo.
But nearly 3 months later of no pmo and I haven't really seemed to have made a dent in my symptoms but it's possible that not enough time as passed. It's also possible (and in my opinion more likely) that what I'm truly suffering from is sleep fragmentation caused by my diagnosed moderate sleep apnea. But as already stated that's no reason to go back to porn; I need all the ammo and every advantage I can get. I need to attack this from all possible angles.
It's just that, as it relates to my sleep apnea, the way forward is not quite so clear; it will take some work on my part. It will take some work to figure out what the next best step might be as I move from more to less conservative on the spectrum of sleep apnea treatment. I think I already know the answer here (palatal expansion to improve nasal breathing - which is shit). The next question is how the fuck do I get the 30k that I'll need for the treatment lol. But one step at a time.
In retrospect, I think it's pretty clear how I had become sort of complacent and had just been existing for the past couple years because I didn't want to have to experience the pain that comes with trying to figure all this out. I have no doubt that pmo played a big role in that complacency, and now that it's no longer there I have nothing holding me back from trying to figure this shit out.