Extreme shoulder pain

Patient: Hi, I am suffering from severe pain of the left shoulder, neck, elbow and back. I have been diagnosed with a a rotator cuff injury. However there was no injury and the increase in pain was gradual. I’ve been taking naproxen for six days with no improvement. I have been taking Tylenol 1 ( the kind with codiene)What else could this be, and what other treatments are

Symptoms: Extreme pain in shoulder extending into neck arm and hand