I Fell On My Elbow About A Week Ago. I

I fell on my elbow about a week ago. I didn't go to the doctor because it wasn't swollen. A week later and it hurts to straighten it and keep it in a bent position. I've isn't helping and from what it appears that there is no swelling or anything. It hurts a lot and I can't use this arm really at all during the day. Please help