Apply cold compression (ice pack)for swelling. For the pain u can take ultra sound therapy(also helps to reduce swelling) and interferential therapy for 5 days(for pain relief). Then start with gentle shoulder stretches .
Next Steps
if pain doesn't subscide even after the traetment ,consult an orthopaedic.
Health Tips
don't sleep on to that side , don't carry heavy bags or anything heavy on that side of shoulder