Ouch! A relative of mine did the same thing, getting up and not realizing her foot was asleep. I tore ligaments stepping off the side of a concrete sidewalk and twisting my foot.

You are doing all the right things. I hope you feel better soon.
And yeah, get an xray, on the house, so you'll know what you are dealing with.
Often, though, torn ligaments and tendons hurt more than a fracture. It might feel good to get a thing-a-ma-bob to wear on your foot that stabilizes your ankle and bring amazingly quick relief.