Get it looked at by an upper limb specialist, if possible.
I had a nasty off in 2004, resulting in arm dislocation and a grade V/VI A/C separation, among other things. The separation was missed due to soft tissue trauma and the dislocated humerus. In the end, it took four bouts of surgery to repair and restore some functionality.
It is still a long way from right, though it is at a point where
I can live with it.
Apparently, the biggest contributing factor to the long term damage and slow recovery was the fact that it was not operated on within the first four weeks. This is the case with all A/C injuries that require surgical attention.
Early physiotherapy to help with the other dislocation may have actually made the whole thing worse.
I would get it checked out thoroughly before attempting rehabilitation, as the severity of mine was missed on the first set of x-rays.
It is always nice to be sure.