How to get rid or reduce major back pain?!?

I'm a cheerleader and this past season while doing some gymnastics i heard my back crack, a tingly feeling went through my spine and it knocked the wind out of me. I went to the doctor because they thought i fracture my L4 vertebrate but that turned out false. Ever since then my back has been in extreme pain whether i'm doing cheer or just walking. I've tried tons of pain killers, a heating pad, and a hot water bottle but nothing is working. My dad won't take me to the doctor because he said their isn't anything wrong with me. Since cheer has started up again the pain has been more than it ever has, its just getting worse and worse. i can't twist my back more than about 20 degrees to the side without excruciating pain. how can i get rid of this or at least reduce the pain? It's my lower back also.