I have a really sore ankle from falling down the stairs sore to walk on bruised and swollen have i sprained it or something worse ?

At least a sprain...: You definitely have sprained it. Using rice (rest, ice, compression, and elevation) for it can help over the next couple of days. Ibuprofen or Naproxen are good anti-inflammatory meds to take over the next number of days also (better at reducing swelling than tylenol (acetaminophen)). Having point tenderness (sharp pain with pressing on a spot) can sometimes mean fracture. Hope you feel better.

See a doctor: From your description you at least need an x-ray to rule out fracture.