A few years ago my wife was T-boned by a driver running a red light.
She had multiple injuries and even "died " twice before reaching the hospital. Like you she doesn't show it but she can't stand,sit or even walk a long time.
Since we have been cruising she has always been allowed to use the priority boarding because she carries a state-issued I.D. showing she is legally disabled. She simply shows her I.D. and all members of her party (usually no more than four) are offered the same courtesy . We are brought through a special security line and then to a counter to get our S&S cards and then seated in a special area to await boarding right after the bridal parties. This is New Orleans so I can't speak for other ports but who knows? No harm in trying. We do,however,make it a point to get to the port about 10:00 a.m. so there's really no mad crush of passengers wanting to board.
I'm sure it will all work out better than you expect it will.
Have a great cruise!
CARNIVAL SENSATION 2005 (HURRICANE DENNIS CRUISE)
CARNIVAL FANTASY 2008 (THANKSGIVING CRUISE)
CARNIVAL TRIUMPH 2009 (BIRTHDAY / FAMILY CRUISE)
CARNIVAL TRIUMPH 2010 ( "SERENITY" CRUISE [ NO KIDS] )
CARNIVAL TRIUMPH 2011 (GRADUATION / FAMILY TOGETHER CRUISE)
CARNIVAL CONQUEST 2012 (BIRTHDAY / MARDI GRAS CRUISE)
CARNIVAL CONQUEST 2012 (YOUR NAME DOESN'T EVEN GO IN THE HAT CRUISE)
CARNIVAL CONQUEST 2012 ( WE'RE IN JAMAICA WITCH! CRUISE )