Your description suggests that your symptoms are likely due to GERD or gastritis (or peptic ulcer). You may try following for the long term measures;
1) antacids; Maalox
2) acid blocker; Prilosec
3) loosing weight, if overweight for long term
4) avoiding alcohol, citrus fruits and juices, chocolate, and tomato based products
5) avoiding large meals. Eat 5 small meals in a day.
6) wait three hours after the meal before you sleep.
7) elevate head end of the bed by 8 inches.
For acid reflux (GERD), following also would be helpful;
1) Nux Vomica
C. Nutrition and supplements;
1) Multivitamin; vitamins A, C, E, the B vitamins, and trace minerals, such as magnesium, calcium, zinc, and selenium.
2) Probiotic supplement
3) Omega 3 fatty acid
4) Avoid; cookies, crackers, cakes, French fries, onion rings, donuts, processed foods, and margarine.5) Also avoid; white breads, pastas, and especially sugar, red meats,
6) Eat lean meats, cold water fish, tofu, beans, olive oil
The other possibility of the diagnosis can be gall bladder stone. I do not think it to be heart or lung related or pancreatitis. But if the severe pain persists; it is mandatory to get an evaluation done by the doctor and an EKG may be done (just to categorically rule out heart related issue).
Please feel free for your follow up questions.
I would be happy to assist you further, if you need any more information.
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