Respected User, hi I evaluated your query thoroughly.
*There are variety of reasons causing your symptoms in absence of Heart
attack - Psychological - Costochondral pain - Severe
acid reflux -
Stress anxiety induced - Pulmonary
hypertension - transient adrenal drives from
various reasons ( & much more but not mentioned here )
*When tests in ER ( I assume included Laboratory work up , X-Ray chest,
Electrocardiogram , 2D Echo ) are normal it rules out severe underlying
pathology, but once our subcouncious mind takes it granted as Heart
attack , we repeatedly correlate any discomfort into that only.
*Suggestions for you in a nut shell :
@ Avoid stress / anger .
@ Have adequate sound sleep of 8 hours.
@ Avoid oily / spicy / nonveg stuffs / beverages.
@ Avoid watching horror movies / thrillers.
@ Do
meditation exercises, YOGA , Deep breathing exercises daily at home.
@ Avoid
smoking / alcohol / abuse substances if any.
@ Avoid prolonged fasting / overeating.
@ Maintain your hydration by plenty of liquids.
@ Maintain your BP , Blood sugar,
Cholesterol levels , weight under control.
@ BE POSITIVE in life, take minor issues as challenges , still lot more in life
to be coming which will be revealed with time only.
Hope this clears your doubts.
Thanks for using Health Care Magic & reviewing my answer thoroughly.
Wishing you happy healthy life ahead.
Regards.
Bye dear take care.