My Son Of 9yrs Old Has Had Arm/shoulder Pain Since

My son of 9yrs old has had arm/shoulder pain since Saturday night, paracetamol and ibuprofen pills and ibuprofen cream has not been working, to ease his pain he had been to A&E department last night and doctor was no help and said take him home and see what happens I told him pain relief was not working and pain is still no better would should I do