Left shoulder hurts when raised. has clicking sound sometimes, hurts to sleep on. sometimes get pins & needles down arm to fingers. x-ray & ultrasound clear. neck on and off pain but doesnt feel related as feels deep in shoulder. what could it be?

Possible emerging impingement problem such as adhesive capsulitis or rotator cuff tear. But alternatively, there may be a problem within the brachial plexus. Testing for hypothyroidism and diabetes plus MRI of shoulder might be approaches. If no answer here, EMG of arm might be done to assess thoracic outlet. First, consult with orthopedic surgeon.

anterior or other shoulder Instabilty with anterior apprehension sign and some element of so called "dead arm" labral tear is one option talk to your Dr about an MRI and/ or seeing an orthopedic surgeon