Was it this one? http://www3.acep.org/patients.aspx?id=26018
IMHO, if you think you need to go to the ER for a medical screening exam then do so. The ER physician will decide if you have a true emergency when you are in doubt.
Pain is a symptom, but can often be the presenting chief complaint for many patients in the emergency department. Although the disease or condition causing the pain may not be within the realm of the emergency physician to definitively manage or even in some cases diagnose, there still remains an expectation to treat the symptom.
Just some fyi.