Ugh, I feel your pain!!
I'd like to say that since school nurses are vastly outnumbered by teachers, we get overlooked/stepped on. But this theory doesn't work out. In the hospital setting, the nurses have the large numbers. But, we still end up being treated badly. Unfortunately, I think it's a "nurse" thing.
In my school, I never get to take a true lunch break. In fact, when I go to the ladies' room, I can often hear people in the hallway outside looking for me. Eventually, they pound on the bathroom door to find me. They all know that If I am not in my office, I have to be in the ladies' room. I never get to go anywhere else! It's a big joke to everyone. They all know I don't get any breaks. It would be so nice for someone to actually pretend to be concerned about that! I have seen teachers throw complete hissy fit tantrums when they don't get their "prep" time, or if it gets cut short for some reason... *sigh*
Basically, we are expected to be selfless, angel-of-mercy type people. Ones that do not ever need to pee, poop, or eat...
I really do love my job. But, we all gotta vent sometime!