Tylenol is your friend.
Just remember: the more you move, the easier it gets. A year from now you'll look back on the post and shake your head at what used to hurt that you do now with ease.
When I started i couldn't walk longer then 15 min/0.5 mile. I was huffing and puffin and my back was screaming!
Now 45 min is a breeze and I need an incline on a treadmill to make me sweat.