Sorry to hear about your shoulder, Dave. I did the same thing a few years ago in Nebraska. Didn't hurt real bad until the next day, and then things went downhill. Doc did Xrays and didn't see anything. Thought I might have damaged my ribs. After a week or so of going back they finally did an MRI and saw that I had damaged my rotator cuff. I had surgery for that, and then didn't give myself enough time to heal, pulling things loose. Back to surgery AGAIN! Took me many months before I was able to lift my right arm over my head, but I finally got there.
I guess I'm trying to say that if you don't feel you're making progress after a week, ask for the MRI. Xrays don't show that kind of damage.