Chemistry for sure. One of the things is expectations. Then our ideal world (I think this world actually exists in a very strange strata of reality) colliding with external imperfect one. Different kinds of fears. Separation. Physical endangerment. Fear of imaginary god or guilt. Delusions. Overthinking and obsession. And it goes on and on...
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that weird hidden space:
http://namshub.netii.net/
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