Kindly visit a good physiotherapist to get it checked.
Pain in shoulder can be due to many reasons so get it treated well.
Pain killers will temporarily relieve your pain, to get the permanent cure u need to treat the root cause.
Next Steps
apply ice packs locally at the painful site for 5-7 minutes 4-5 times daily.
Health Tips
Follow the do's and don't s. follow the advices given by the physio, further do the scapular strangething exercises and shoulder exercises.