I've done this twice. Everyone heals differently.

Go to the vitamin store and get some calcium/magnesium/D, eat well, rest and if you are REALLY lucky you will be able to ride in 5 weeks from today. It will stop hurting when it stops hurting.

And wash that bra they give you often. If they gave you one. Depends on the break.

http://en.wikipedia.org/wiki/Clavicle_fracture