What's the point of a diagnosis?
Relief and understanding.
Relief in knowing that my "weirdness" is actually something beyond my control, and the understanding of why I am the way that I am. Now I know better what situations to avoid, and which activities actually benefit from my Aspieness.
It's not a label if no one else knows about it.
Yes, a diagnosis would require a mental health professional, preferable one specializing in Autistic Spectrum Disorders..
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The mere fact that science may not yet adequately explain an object, event, or experience does not mean the immediate explanation should automatically default to a conspiratorial, extraterrestrial, paranormal, or supernatural cause.