Six months post-op from reverse right shoulder arthroplasty. woke with intense, sharp pain upon moving the arm. with forearm on my lap i am okay. walk-in clinic xrayed, not dislocated. surgeon away 2 weeks. any ideas? will immobilize, ice for now?

Dislocation would be high on the list of possible causes of your pain on motion, but the xray was ok. However if rest,icing,taking nsaids like ibuprofen or naproxen don't provide gradual relief of symptoms I recommend having a teammate of your vacationing orthopedic surgeon see you promptly. The squeaky wheel gets the oil in medicine as in other aspects of life.

could be a rotator cuff tear I would ice it, take pain medications, use a full arm sling if needed for comfort and see your surgeon when he comes back best of luck