You need to get rechecked. The CPAP or BiPap machine usually cures sleep apnea, and most of my patients improve and feel better on the machine. Your mask might not fit properly. Also, there is surgery that helps: surgery of the palate, and also tracheostomy in severe cases used to be done in the old days(not used much nowadays, since other means work).
Tongue biting suggests epilepsy. Tests for epilepsy are not very accurate.I've had patients with major brain injuries who had several seizures a week yet had normal EEG's and CT scans. Sometimes a course in treatment will be done: you treat it to see if it gets better. This needs a good neurologist (a lot of neurologists aren't helpful, you might need to see another one).
Thanks, LadyDoc. I had a Lady Doc for my Cpap. She is in Indiana. I have had a few times when I awake and feel wonderful. The chin strap I use is not strong enough to withstand my jaw muscles, I guess. I made a much stronger one, which works, most of the time. I have a full mask. It surrounds the bottom and circles around the top of my nose. I think it is one that is used when there is alot of movement is expected. I had eeg's and other tests, that showed negative. Epilepsy is not in my family.
I went to a neurologist only once. I use my machine every night, but sometimes don't put it back on, when I go to the bathroom. It is somewhat bothersome, but so is a sore tongue. Thank you for your advice. I will check out another neurologist.