sorry to hear you're not feeling well. Any chest pain lasting more than a few minutes is considered an emergency and should be evaluated by the ER (or doctor's office).
In terms of outpatient care for stable patients, there is a protocol that is followed for evaluating chest pain--based on symptoms, exams, chest x-ray, initial EKG and ultrasound of the heart. From there, the plan is made for other testing--cardiac or otherwise. I am being worked up for chest pressure and PVCs and it is not a straight line to an angiogram. I've spent about one month getting an echo, stress test, blood work and holter monitor.