BiPAP/AVS HELP!!!!

Any suggestions on how to adust to breathing on these dang things? I spent last night at the sleep lab because the CPAP was not reducing my AHI (don't have a data capable machine except compliance and AHI average). The tech started me on BiPap and I had trouble falling asleep because I could not coordinate my breathing with the ebb and flow of the BiPap, which was freaking me out a bit. Eventually I fell asleep and woke up with a nightmare. I'd been switched to the AVS and that was a disaster. The tech said I was doing fine with it while asleep, but as soon as I woke up it was awful. I tried to keep my breathing as regular as possible, but the machine either "breathed" too fast or something. About every 4th breath was okay and in sync with the ebb and flow of pressure from the machine, but otherwise it would start upping pressure in the middle of an exhalation, which made it feel hard to exhale, or would be decreased in pressure while I was inhaling (which I guess in some ways it's supposed to since it's on auto and would only give the pressure it thinks I need?). It made me panic and I couldn't regulate my own breathing enough to fall asleep. I tried to match it's pace but it was so fast compared to the way I usually breathe that I was feeling like I wasn't getting enough air or might hyperventilate.
Tech thought I REALLY needed the AVS because my apnea was all central and decreased on AVS, but on BiPap increased over my study from the CPAP titration. But she put me back on BiPap and I managed to fall asleep for awhile still struggling to coordinate my breathing with that. She was afraid to put me back on the AVS because of my reaction to it.
Her comment this morning was that she's glad she's not my doctor and doesn't have to decide what to do! I have a feeling my graphs and my video is going to end up in the lecture hall at Penn State.
My guess is the AVS and a hefty dose of anti-anxiety meds, because I know with my irregular daytime breathing, the more I obsess about it the worse the breathing gets.