Symptoms: shoulder pain (shoots down arm&back), burning sensation, tingling, cant sleep on shoulder, hard 2 lift, worse at night, weak, popping noise

A-C Joint? . If a young person were to have shoulder pain with pain lying on shoulder at night & weakness with lifting & a "popping" sound. A consideration is A-C, acromioclavicular, separation. Has there been a traumatic injury or fall onto shoulder? Skateboarding? See an Osteopath or Physiatrist. A-C joint X-ray films standing upright with & without weights might be needed; as well as an MRI. .