3rd sleep study, consult, now what?

Hi
I am back from the consult from the 3rd sleep study in the last 4 months. Doctor was pleased to say that they had found a pressure to relieve the OSA to an acceptable level. It seemed he was going to leave it at that and send me on my way, without even addressing my major concern. All three of the tests indicate that I have severe Central apnea, even at the best PAP pressure. I asked him about the Centrals and he said the machine was controlling the obstructive apnea and that there was nothing he could do about the centrals, other than some pills that would keep me awake.

From your combined knowledge and experiances, is there nothing to be done? I have read about the new CS-2 machine by Resmed, it is promising some relief from centrals, just not approved for use in the US. Anyone heard of tests going on with CS-2 which might need people for testing?

Thanks for all of the information in the past, it is appreciated.
Dave