hi im nearly 18 years old, and ive had back problems since i was 12 due to a car accident. but the last year or so i have been getting sharp shooting pains from my upper right back and chest up to my right shoulder blade. it hurts so bad that i dont wanna breathe because when i take a breath in, it gets worse. i just sit ther and wont move because im nearly in tears with the pain. it only lasts about 2 minutes and then it will go away. this could happen 2 or 3 times a month. any suggestions on what could be causing this? i would greatly appreciate it. thanks