Hello. I will be very grateful for some help.

1) Which is correct: "The woman fell and hit on the sidewalk", "hit against the sidewalk" or "hit the sidewalk"?
2) I want to say that the pain is extremely bad, so which is correct:"My leg hurts/is hurting very much/ so much/ a lot/ badly"?
3) Is it possible to use progressive in the question "Where is it hurting" or is it "Where does it hurt"?
4) Is it OK to say "Where does it hurt you?" and "Where do you hurt"?
Thank you a lot.

1. hit the sidewalk

or
hit her head on the sidewalk

2. Both hurts and is hurting are correct.
very much, so much, a lot

3. Yes, both are correct.

4. Both are correct.