Broken????

I fell down the stairs 2 times, I went to the DR right after and she was suprized there wasn't a brake. It was really big and swollen, i went in again yesterday, she gave me a new boot I have been useing it and today less than 24 hours the swelling is almost gone! I don't understand how. I still have the same amount of pain in my foot, they were saying something about a hairline fracture. When i went in yesterday i couldnt move my toes very well so she said for me to get a MRI on my foot but i can move them pretty well now, do I still need to go in for the MRI? Could it still be broken? I had symphoms of a hairline fracture (brake in your bone) my foot still fells like it is just burning and it hurts super bad. I have been raping it with ace and my boot, it has been elevated only swelling went down, pain still the same before the DR said it is way more swollen than a bad sparin would be. PLEASE HELP FAST!