Still tired weeks after beginning CPAP, help?

I am pre-op (BMI 42) and been using my CPAP machine (level 10) for weeks now. I use it the whole night. I am still very very tired. I still dose off if I am not constantly doing something. And driving I still get that turn up the radio or else feeling. This is scary stuff. Whats going on? I thought I would feel great by now. Any suggestions? What can I do?

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