Back Injury, Please help? I need advice!?

so I'm young, and I've had a back injury for two years. I don't know how i got it, but it just started to hurt, but in the last two months it has crashed. It is so bad. I'm in karate, and even if I train for an hour, it hurts within 5 minutes. Last night, i was crying driving home because it hurt sooo badly. It is al the way from my neck down to my lower back. I can barely move when I get up in the morning, and it hurts all day. What can i do? I've had IMS, and gone to a sports doc, everythign just makes it worse. I'm only 14. I've had xrays, IMS, and chiro, nothing is helping. I just need it to stop. What can i do, has this happened to anyone before?