As an Osteopath I can verify that medicine is a "best guess" principle, taking into account case history, signs and symptoms.
GET BACK TO ACCIDENT AND EMERGENCY DEPT.
Before you go write down what it feels like, type of pain and location. I.e. is it constant or intermittent, sharp or dull, any radiations (does the pain travel anywhere), aggravating or relieving factors (what makes it worse or better).
If pain is as bad as you say it could be a medical emergency and needd immediate action.
once again, GET BACK TO A AND E.

Colyn.