What Causes Pain From Top Of Shoulders To Chest?

my arm hurts at the top by the shoulder joint but its not the shoulder, it hurts when i raise my arm just above the shoulder heigh, when i bring it across my chest,when i try and bend it back to do my bra up,if i lay on it at night im in agony, if i put pressure on my hand it shots a pain up from the elbow to the back of arm and into the shoulder, Iv had this pain since i had a gallstone attack. Thank you