Ouch, @werrie. I've fractured my wrist bone twice. I know that pain well. It hurts. For me, I iced and kept my arm elevated. This will also help reduce the swelling. Keeping the arm immobile helped to reduce the pain too. During the day I was able to manage without pain meds, but at night I took extra strength Tylenol.
When did you injure your arm? Did they give you anything for the pain?