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I think what we often consider "emotional distress" is a form of physical distress.  We can more easily understand physical stress because it often involves a physical stimulus(a hot stove perhaps).  Emotional pain may seem like it lacks a physical cause but I believe it does not.  During what we perceive as "phsyical pain" a pain receptor is activated, information is sent to the CNS, and we endure the symptoms of what we know as physical pain.  We perceive emotional pain through a different set of receptors. That is all.  We see someone get killed maybe, rods and cones in our eyes detect light, send information to CNS where it is processed, and we feel symptoms like eyes watering or nausea, or what we think of as "emotional pain".  But aren't they just one in the same process, just taking different routes?