My Arm Really Hurts!?

Saturday I fell down a hill backwards and landed on a previously broken arm. (It was a buckle fracture. And I could still move my fingers and arm. I didnt know it was broken 4 a week!) The pain is similar, and it hurts to touch where I fractured it before. Also, my hand really hurts. It hurts to put pressure on my arm and it also hurts to move my wrist around. Do you think it is fractured again or just a bad sprain. Also, what would a doctor do for a bad sprain?