Good luck to me & Gesu Bambino!

Man...oh man!
Tomorrow at church, I'll be singing, Gesu Bambino, in a duet.  Typically, I wouldn't mind singing at church....but......

See that VERY top note of "G", that's what I've gotta sing up to!  Lately, my voice has not been hitting those so nicely.  It's screechy!!  In the duet, I'll be singing the higher of the two voices.  I'm getting really nervous because I don't know what to do.  I'm trying to remember all that Hermana R has taught me, but I'm honest to goodness nervous!  Especially since I've gotta sing that note, at least, twice during a solo part. MAN!! AAAAHHHHHHH!!!  PLUS, it doesn't help that I'm bloated [read: menstruating].  Hermana R told me that Opera singers sign a contract saying that they cannot perform during their menstruation.  The female body retains water during that time (we already know this), and it also retains water in the vocal chords, thus altering the singing voice.  Don't believe me? Here's a link.

Good luck to me.
Hope I don't embarrass myself TOO badly.  Oh man....and Oeste will be there.


Wish me LOTS and LOTS of luck!!