Hurt shoulders

i need some info. I first hurt my shoulder in 2001, had some x-ray and the doctor said nothing was wrong.When I would use it alot it would be sore, it got so bad that I couldnt sleep on it at night, in july 2004 I hurt both of them while at work. My question is could it had been a old injury that really started in 2001, I have a tear on it but the company is fighting me because i broke my shoulder in aug while off of work. My doctor said it has nothing to do with my ratator cuff but they dont believe him. I think the ratator cuff started in 2001 and finally tore.. help me out…