This error will be my death

Things are going awfully. I’ve been working on a short for two weeks, which is supposed to be showcased in less than a week, and my plan is slowly coming apart,adn tis all due really weird audio problems i ahvent experienced before. Until about an hour ago, it was going fine, but sometimes the audio overlapped between scenes, which they weren’t supposed to. So to resolve that i put the error sounds in a movie clip. Later after creating a scene, i douns that when i tested the audio, the sound was totally missed out. So i too put the sounds into movie clips. Now, i’ve retested my film, and loads of audio is missing. I don’t know what’s going on, but when i test the scenes individually, the sound is fine. Does anyone know how to resolve my problems?