RUDE SCHOOL FACULTY? PROBLEMS AT SCHOOL!?

OKAY I AM 15 AND IN THE 10TH GRADE. I AM SICK A WHOLE LOT AND ALSO HAVE SEVERE EMOTIONAL PROBLEMS WHICH MAKE SICKNESS WORSE. I MISS A LOT OF SCHOOL BECAUSE OF THIS. (I AM UNSURE OF HOW MANY DAYS.) ANYWAY WHENEVER I GET BACK TO SCHOOL I AM ALREADY STRESSED OUT WITH THE THOUGHT OF MAKE-UP WORK. BUT TO MAKE IT WORSE, WHEN I GO INTO THE OFFICE TO HAND IN MY EXCUSE FOR THE ABSENCE, THE SCHOOL SECRETARY, OR WHOEVER HAPPENS TO BE IN THE OFFICE IS VERY RUDE.FOR EXAMPLE, I WILL GO IN THERE AND WAIT FOR SOMEONE TO IST ME WITH WHAT I NEED. MEANWHILE THE SECRETARY, THE SECRETARY HELPER (TEENAGE GIRL), AND THE PRINCIPAL ACT LIKE I AM NOT THERE! THEY SIT THERE AND TALK OR ARE ON THE COMPUTER UNTIL FINALLY THEY LOOK UP AND SOMEONE WILL SLOWLY WALK OVER TO ME AND GRAB MY EXCUSE AND WRITE ME OUT AN ADMIT SLIP. ALSO, I GET THE VIBE FROM THE SECRETARY THAT SHE THINKS I AM NOT SICK. SHE GIVES DIRTY LOOKS, TALKS RUDE. ONE TIME I COUGHED WHILE SHE WAS WRITING MY ADMIT SLIP AND SHE KIND OF LAUGHED AND THEN SCOFFED AS IF TO SAY "OH MY GOSH." I AM AN 'UNDERDOG' IN THE SCHOOL. ANYONE WHO IS NOT A BALL PLAYER OR CHEERLEADER GETS TREATED THIS WAY, BUT THE SECRETARY SEEMS TO HAVE SOMETHING PERSONAL AGAINST ME. THERE HAVE BEEN SEVERAL OTHER INSTANCES WHERE SHE HAS BEEN VERY RUDE TO MY MOTHER AND FATHER AND TO MY FRIENDS. SO MY QUESTION IS: WHAT CAN I OR MY PARENTS DO ABOUT THE RUDENESS IN THE SCHOOL OFFICE? THE PRINCIPAL WILL NOT HELP BECAUSE SHE IS RUDE ALSO.. I LITERALLY GET PHYSICALLY SICK WHEN I KNOW I HAVE TO GO IN THOSE DOORS IN THE MORNING.. PLEASE BE RESPECTFUL. AND GOD BLESS.