Given your age (late teens) and the symptoms you have described most doctors would agree that heart / chest disease or a disease of your internal organs is not highly likely. To be certain, however, you can request an ECG, a chest X-ray, and measurement of your thyroxin blood levels.
For acid reflux and stomach pain, it is appropriate also to request an endoscopic gastroscopia and Helicobacter pylori-serology to detect stomach disease (gastritis, hiatus hernia, peptic ulcer, tumors). An ultrasound and a standard blood/urine analysis can exclude or verify disease of internal organs (liver, kidneys, pancreas…).
If the results of these diagnostic tests are OK and normal, then these types of symptoms may be caused by anxiety. Specifically, "somatoform disorder" (International Classification of Disease Code F45) occurs when anxiety manifests via symptoms of various organic diseases. During somatoform disorder symptoms are not the result of verified organic diseases but are expressions of inner emotional conflicts in personality. Expert help from a mental health professional can help patients identify and resolve inner conflicts.
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