All the silly answers aside, chest pain of any sort is nothing to trifle with. There is this thing people do: "let me just ask my friends if I don't feel right". This may not be a good idea, based on the responses you got here. It is impossible for anyone to give you advice over the phone or via a forum. At best, you're going to get smart remarks or stories about similar experiences.

You've gone to the ED. Good. You've been seen by a doctor. Also good.

I worked in the cath lab for 25 years: we did angiogrammes, stenting, electrophysiology studies, etc.  A plane-film chest x-ray will show absolutely nothing about the state of your coronary arteries (unless they are heavily calcified). It's not considered a diagnostic tool for determining whether you have coronary artery disease (although it might show a cardiomegaly, but typically, you wouldn't be presenting with chest pain).

If they suspected a heart attack, the ED people would hook you up to an EKG machine and record a 12-lead (helpful if you're still having pain), draw some blood and do some blood enzyme tests.

Consider this: if you are male, a smoker, over-weight, diabetic (or pre-diabetic), anywhere from 25 to 55 years of age, have high cholesterol (and your LDLs are higher than your HDLs) and you have high lipids, and if you have a family history of heart disease, you have increased risk factors for heart disease.

The only recommendation I can make is this: if you are not allergic to aspirin, keep some handy. If you start getting chest pain, pop one under your tongue and get yourself seen by a specialist pronto. Aspirin has a powerful anti-platelet coagulation effect and putting one under the tongue has the effect of sending the medicine straight to where it's needed: the heart. It's the first-line med given out in the field (away from the hospital) by the medics to a suspected heart-attack victim. That, and oxygen.

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Wir sind gewohnt, daß die Menschen verhöhnen was sie nicht verstehen
[it is clear that humans have contempt for that which they do not understand] 

Metaphor of Chooks