Liz, you said:

He even remembers I'm the one that'll throw up if he moves the chair with me prone in it...

How can he get to your mouth, if you're prone in the chair? As a matter of fact, I've never seen a dentist's chair in which one could even be prone, and least with any comfort whatever.

My dentists over the years have always had me sitting or perhaps supine in the chair.

Dave Oesterreich