Hello. I am Ellan. I have Sleep Apnea and Diabetes and I use Oxygen with my CPAP. It connects into my CPAP machine. But the CPAP is not working. I had a nightmare tonight and woke up with a pounding headache. And most days I do wake up with a headache. How much control do our doctors have over our CPAP machines? Can someone please tell me?! Because I want to figure out who is to blame for the fact that the machine is not working! Thanks! :) PS I am very worried that I am going to die from this disease of Sleep Apnea because it is NOT being controlled!