Sleep disturbance is associated with Fibro, sleep apnea is not. Not to say you can't have both Fibro and sleep apnea. But having fibro does not mean you will get sleep apnea.
My father and my ex-boyfriend both were diagnosed with Sleep Apnea. I did a letter for my ex-boyfriend's doctor to help get him referred to a sleep clinic. He was really bad. There are about five different types to sleep apnea. He had most of them. He snored so loudly he was only 4 decibels lower than a hammer action drill. His breathing pattern was centred around a six breath ritual, in the middle he would have a breath hold of 21-30 seconds, then a gigantic gasp of air, as his body woke up to realising its being starved of oxygen. He eventually got the CPAP machine.
The specialist told him that his body was basically running a marathon every night, because of his apnea. No amount of sleep would help, for on waking he would always feel absolutely shattered and exhausted beyond belief, which would continue all day. The CPAP made a huge difference, but he hated using it and went back to not. It put so much strain on his heart that he eventually had a bad turn and needed a pacemaker. Now he uses the CPAP machine all the time.
My father has AF and sleep apnea and I am trying to get them to give him a CPAP machine, its the best thing to help.
Bar a good exercise routine, maintaining a healthy weight, not smoking, avoiding the foods, drinks and medications that can contribute to the condition and having a good night time routine (i.e. not going to bed with a full stomach etc), which I am sure you have tried.
The CPAP tends to be the best and last resort for most cases as surgery is provent to be less effective. If the CPAP is really impossible for you to use, I dont know of any other options out there, that would have not already have been told to you by the sleep clinic.
If its the mask thats the issue, there are options, my ex had the full mask for nose and mouth and hated it, now he uses the mask just for the nose, this helped him to feel more comfortable.
Dont know if this is much help, but hopeyou find a helpful solution soon.
With loving kindness