Welcome to Healthcare Magic
best management for initial stages is physiotherapy
. Better to consult with good physiotherapist in this regard. Frozen shoulder
can be treated with NSAIDs, steroid injection, but may require surgery if not improving. I suggest you get an ECG done to rule out any heart problem as heart attack
due to low blood supply to heart can also present with same picture. Go to the ER immediately and get properly examined. Don't take chances.