Does it feel like you have a bruise in the front part of your heel near the arch?
Does it hurt worst when you first get out of bed in the morning?
You might have a very common, and very painful condition called Plantar Fascitis.
For more info, and some good stretches/exercises that should help to give you some relief, click the image.
REMEMBER: The sooner you tackle this injury, the sooner you will be up and running again.
If the stretches and exercises are not enough, a good PT, or Sports Chiro might be the way to go!