Thanks for providing more information.
As you describe in my opinion,you need to be seen by a Gastroenterologist for a clinical examination to rule out Peptic ulcer,Hiatus hernia which can result in pain in diaphragm.
You need to undergo Upper GI scopy for further evaluation.
I advise you to start probiotic sachet containing saccharomyces bouladii which can be helpful.
Also hydrate yourself with plenty of fluids.
If you feel shortness of breath then EKG should be done for a precautionary measure.
As sometimes underlying cardiac pathology can mimic the symptoms of indigestion,heartburn.
I hope this helps.
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