Hy there 2 reason in arm pain.
1.cervical with rediculopathy.
2 shoulder r.c.i. injury.
So proper diagnosis consult a physio and ortho surgeon.
Next Steps
initial u continue your same medicine.
1 apply hot packs in neck part 2 times a day.
2 start some neck and shoulders strengthen exercises with theraband after pain relief.
Health Tips
avoid weight lift from right hand.
avoid right sides turns during sleep time specially.