Thanks for providing more information.
I understand your worry about chest pain and shortness of breath.
However i want to assure you that chances of any serious condition like Heart pathology,embolism are less likely as your most of the investigations are fine with normal results.
As you have history of acid reflux so it can be a contributing factor in chest pain so it's good to see your family doctor for a clinical examination and further a referral to gastroenterologist can be advised.
Prescribed medications like H-2-receptor blockers,Prokinetics can be given to relieve acid reflux.
Avoid caffeine,spicy food.
Your blood pressure should be monitored at regular intervals.
And if your chest pain persist then Echocardiography should be done as well.
Hope this helps.
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