My rib cage hurts when i move and really hurts when i cough. My neck is also sore.

I have not been coughing to make them sore. Is there something wrong or have i just hurt my self and not realised as i feel like i have taken a few shots to the body, feeling bruised!? I have been quite stressed resently and also eating less, do you think this could have an effect?

 I am 24 yearold non smoker, 5 feet 5 inches and weight 9 stone. My diet is ok and i have good overall health, apart from the ache in my bones?