I have this sharp pain in my right, middle part in my back. It feels like a bone or something broke and is tearing into muscle. But get this. It only happens like every October-early December. Every other time it's fine. I first noticed it when I was in 8th grade and now its happened every year and I'm currently in 11th. It hurts when I breathe hard like playing football, but it fells like a muscle problem. I've searched stuff but can't find anything. Please help. Thanks. 