Writing Wednesday - More of an: Idea for a Story talk Wednesday

I WANT to write a story about something that happens to me. But, I'm not sure how to go about it. Here's what happens:
As I walk to the school to fetch various kindergarteners, one belonging to me, I have visions of Worst Case Scenarios (Dark Visions is going to be the title of the story) and then I think about what I would do, how would I react in each scenario.

I see myself falling on the ice and breaking my leg and having to pull myself along to a nearby house.
I see a mushroom cloud in the distance and imagine myself instantly not exsisting and ending up as a black sillouette on the brick wall of the school.
I see an earthquake happening as I walk to the school and see myself getting to the school and huddling with my kids and waiting to see if my husband will make it to the school...
On the way home I can see kids impaling themselves on sticks that they are running with...
I see that stupid pit bull that gets out of his yard, attack us and rip up my arm because I'm trying to protect the children (would I be able to ever crochet again?).
I see a kid I'm supposed to being taking care of Jump off of playground equipment and break his leg,
I see a kid NOT listen to me and run out into the street and get run over by a car who didn't see him because they were talking on their cell phone.

Then I get home and sink in my chair and sigh a big sigh of relief... I made it home... nothing bad happened! Whew!
and then...
What if one of those things ACTUALLY happened and because I have been running it through my mind and thinking about what I would do if that happened... I was the hero because I was able instantly jump into action and save the day!

Anyway. That's MY idea. And I will keep thinking about HOW to write that into a story.
Thanks for listening.