It could be that you've suffered an AC joint separation. Your ortho will look at your xrays and be able to tell you all about it and give you options. Best of luck!
All I can add is that the doc in the ER dropped the proverbial ball. Shame on them. I may be wrong, but anytime there's any new deformity, especially with trauma, a thorough history and physical is necessary. That you're seeing an ortho soon is great.
Sue :)