Twisted My Ankle

I was walking up the stairs on wednesday and was just about on the last rung at the top, when i twisted my right ankle and fell. I ended up going to the doctors to see if it was broken. The x-rays came back negative. Its just a severe ankle sprain. I will be in an "aircast" brace for about a week or two. Needless to say...i will not be running in the dallas marathon this weekend.