Psychic shielding - Exhausting feeling when walking through the city

[Realtime]

I can't say if there is any reality to it though I can relate to your problem. Many factors may be involved. Consider, for example, that cities are bad environments in any sense, e.g. traffic and general noise, very bad air, EMF contamination. In pedestrian malls, the face recognition engine works like crazy, thereby causing slight weariness in the brain. Psychic energy draining might be less involved since there is no actual interaction taking place between people.