I have seen how sleep apnea can cause problems and make a person suffer.
My brother had it and went through the sleep study. He slept with oxygen at night as he stopped breathing so many times through the night Dr. told him he may stop breathing and not start again.
He had nickel size scar tissue removed from his nasal passage. A few weeks later he had a tonsillectomy, the uvula removed and the soft palate scraped to reduce the size of it. This surgery made his air passage larger with no obstructions. He is now able to sleep without oxygen, does not stop breathing while asleep and his energy level has increased as he gets the sleep and rest he needs.
All of this sounds drastic and hope you don’t need it but just wanted to let you know that it did work for my brother.
Take care and good luck