Busted collarbone definitely very painful the first few days until it knits. Much better after that.

You said you are in a sling...but that's for your arm/shoulder dislocation. If you have a busted clavicle you should be in a harness that keeps your shoulders back and restricts the forward motion of your shoulder so the ends of the clabicle don't rub against eachother.

Maybe its different now (mine were years ago) but I'm thinking you should be in a harness until the bones knit.