Shoulder pain its been 1 year now and the doctor can't find anything wrong but the pain is getting stronger and spreading through out my entire arm?

Muscle spasm: There could be a lot of causes of pain around the shoulder, see if the the one you have is there all the time, especially at night, than it could be a muscle spasm of the on of muscles from the upper back, rhomboid is most common.see a pain specialist or physical therapist in your area, refrain from heavy lifting for now, do some stretching