Well I just got back from the Dr.. Good thing is, it's not my shoulder after all. Bad thing, it's "referred" nerve pain from my neck. Probably due to being treated by the chiropractor since December. He says it's most likely due to inflammation from all my manipulations, and that is pressing on the nerves.
But he gave me orders for a CT scan of my neck so we can get a better picture of exactly what is going on there, that we can share with the chiropractor. Although the chiro took x-rays, this will give us a clearer picture of things. He said most likely I just need to hold off on the manipulations in my neck until the swelling goes down. But the CT will tell us if there is anything else going on that we might need to be aware of.
And he gave me good pain meds.