@brendaelk1
Do you still have the CPAP you were using? I don’t know what kind of insurance you have, but you and I are almost the same age(I’m 71) so if you’re in the US you probably have Medicare. I know they won’t pay for two cpaps at once, so did you have to get rid of the cpap or was it paid off after 3 years?
If you continue to struggle with the bipap and the dr you have isn’t helpful, one option is to go back to the CPAP while you look for another dr. An ahi of 15 with the bipap suggests to me that something isn’t adjusted right or it’s not the right machine for you.
What was the major issue with the CPAP? Pressure wrong? If it was a resmed airsense it can be operated as an autoset that has a minimum and maximum pressure which can both be adjusted. There’s also a feature called epr(exhale pressure relief)that can be turned off or adjusted from 1 to 3.
Not telling you to do this, but getting into the clinical settings is very easy. I suspect most of us who have survived CPAP learned how to do it out of necessity. YouTube has videos that explain it.
Best of luck whatever you decide!