TB Mask Fit Testing

OK, so who knows how often this REALLY has to be done?

My hospital recently instituted annual fit testing, which seems pointless unless you gain or lose a whole bunch of weight, grow a beard or otherwise change the size and shape of your face. I was last fit-tested in 1999, and to be honest, even the prospect of doing it even ONE more time sends me into orbit, as I am EXTREMELY claustrophobic and dang near lost it the last time they put that plastic hood over my head.......I don't have a problem wearing the respirator itself, just being tested for the right size.

Assuming I can't get out of it (and that's a pretty good assumption), is there ANY other way to do fit-testing? I was ready to run for the Ativan this afternoon when I got the notice that I had to make an appointment for it, and I'm hyperventilating just thinking about it........it's embarrassing to be such a wuss, but if you put me in the middle of the Houston Astrodome and I couldn't get out, I'd panic!! So the plastic thingie over the head and face is not something I deal with very well......HELP!!