That doesn't mean that you should submit to further studies, especially given your insurance situation. I know on the other forum you were pointed to several affordable machines. The PRS1 960 in particular could do anything you need, and you might want to grab it. In your shoes, I'd lay things out to the sleep doc very clearly and ask him for a prescription and recommendations. If he feels his last study was so incomplete he cannot make a recommendation, then perhaps he should foot the bill to make it right. His incomplete study protocol should not be your problem since complex apnea could have been anticipated with the first study, and would be required in about 15% of the apnea population even without the diagnostic information he was aware of.
Your situation is not fair, but many of us have had to self-finance and self-titrate. Your situation is just more complicated by apparent complex apnea you have.