It's possible that your bruxism is not caused by sleep apnea, as you mentioned. Still, it's also possible that the misalignment of your jaw and teeth contributes to both issues. It's worth discussing with your specialist to see if there are any other solutions, like a device that doesn't put as much stress on your teeth, or if there are ways to help mitigate your bruxism. Have you heard of Restore Mental Health? They have some great resources on sleep disorders and mental health. One thing to remember is that dry mouth can be a side effect of using a CPAP machine, so that may be something to look out for if you decide to stick with it. Good luck!