I have had severe pain in my right shoulder for about 9 months. xrays were taken and revealed nothing. can't do mri (cardiac pacemaker) but ortho su?

Shoulder pain: Need to see a physiatrist or maybe orthopedic surgeon to know what's wrong with the shoulder. Once you know what's wrong, the potential treatments can be considered.

CT arthrogram: If you can't do mri, you can try ct arthrogram. This is done with injecting a contrast/dye into the joint before the ct scan. If done right it can be useful in diagnosing rotator cuff tears.