Pat, please, please get a second opinion. With me, they had an anestheologist there who put me under for 5 minutes and snapped me right out. They wanted to avoid any sedation because of my heart, and have "complete control over my breathing," so there was no twilight sleep or slow waking.
You just got your BiPap, and I expect it will improve your FVC.
Sharonca had the PEG without anesthesia (not by choice, but she is here to tell the tale), and I've been told they can often do it with a local, as Rose said.
If you want it, please fight for it. I'll be praying that it works out, and that you gain strength with the BiPap.