Here is a list of the symptoms of some common shoulder injuries:

http://www.freemd.com/shoulder-injury/symptoms.htm

But a lot of the symptoms are virtually identical for sometimes quite different injuries. Basically it almost boils down to "yes my shoulder hurts".

You'll need to see a doc to tell for sure what's going on, possibly an X-ray or even an MRI might be needed to diagnose the actual problem.

BTW, the books suggested to me in this thread on trigger points and frozen shoulder got here yesterday, so I'm hoping I've got something that will help me now.