While you're Googling, Sierra, take a look at Bursitis. Your symptoms sound like an experience I had about 5 years ago. My Dr. (here in the U.S.) diagnosed bursitis and we did a single cortisone injection. He stated that he could only administer the cortisone 3 or 4 times per year, but, amazingly, the pain never returned and I've not had a reocurrence.
Immediately after the injection the pain left but returned (much abated) about 48 hours later and gradually diminished to near zero in about 5 days. Dr. said the cortisone has a mild pain reliever (Lidocaine) mixed in it to provide the quick relief.
Needle looked like something from your worst nightmare but, really, it (the injection) was nearly painless... Best wishes!