You may have rotator cuff injury ,go a physiotherapist ask for empty can test it will confirm that you have supraspinatus injury( most common) to confirm, Do sonography
Next Steps
Physio may do isometric excersice and Take shock wave treatment,Very fast and excellent treatment for shoulder injury
Health Tips
Avoid any activity by that hand for week ,don't sleep on that side for a while and apply ice twice a day for 20 mints .do my keep ice for long time apply 10 sec and reapply
later do exsersice of scapula and shoulder.