There was this clique at school..?

Made up of snooty girls and they seemed to project everything on me. Every sort of problem, like ADD and ADHD. Neither of which I have. In short they bullied me. How do I relay to others that they might have ADD or ADHD? There are also more examples I could give. One girl had to take care of her sick sister so she cooked up that I had what her sister had. They also said I had nits in my hair and contagious diseases when my mom said my hair was fine and my doctor gave me a clean bill of health. How to tell others that these girls are really mentally unhealthy? Serious answers appreciated. I'm at the end of my rope! They really need help.