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So back to your question: 1  Your chest hurts when you're emotionally sad because your brain processes physical and social pain in the same brain regions (dACC and AI) (the affective aspects of the pain). The fact that both pains overlap means the factors that decrease physical pain also decrease emotional pain.
RE the following text: Your chest pain gets worse when you lie down. Pain in your chest that gets worse when you lie down is probably not heart disease. It is likely to be heartburn caused by acid leaking from your stomach and into your oesophagus. This is very common and known as heartburn and gastro-oesophageal reflux disease (GORD).