Projectile vomiting!!!!!!!!!!!!!!!!?

im 16. my brother got the stomach flu with projectile vomiting & explosive diarrhea. he is 7. i drank off his pop last night & took care of him. i was babysitting. its the flu. he had a fever. help i really dont want to get sick! i hate puking. its an aversion. ill want to kill myself. if i get sick, how can i prevent puking? HELP I WANNA DIE. IM SO WORRIED & STRESSED