my sister has ear problems

so my sister is 14 years old. She's always had ear problems when she was young because she's scared of fireworks and anything loud , also she has a wax problem, she always has her ear hurting and waxed up all the time. My parents arrnt doug anything about it. What could my sister have ???? she's going to be 15 and still scared of fireworks. And what's wrong with wax building up in her ear?