I (16F) teen fell down the stairs on June 19th which was like a full week ago but my foot still hurts?

I was going down the stairs to take out the trash and I don't know how I fell but I slipped and fell to the bottom and I couldn't get up after and my neck was killing me and my ankle was killing me. I thought the pain was coming from my ankle but it's like my foot was sending the pain up through my ankle.

I could hardly walk then and my foot was swollen and there was a visible hard lump on it and I could feel my bones. The lump has gone done but it still hurts in the same spot.

I can balance perfectly fine on one of my feet but on the other one that's hurt I can't put my weight on it and balance with it it hurting. My mom brushed it off a week ago and said it was probably a sprain and I'd be fine..but I don't know