We’re not quite sure, but it’s possible the body can’t differentiate between strong enough emotional distress and physical stress. So body goes ‘bad situation? Hit eject button? Maybe? ???’ This is kinda supported by the fact that severe enough distress will trigger flight or fight, but as others have pointed out, gut states and emotional states are interrelated, and vagus control signals can be disrupted (which would cause the same stress results) so it’s not nailed down for certain.
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