The doctor refers to writing, making him evacute things out of his mind, what’s bothering him, etc. It looks like he’s been writing for 3 years, still continuing with his writing/doctor comparative metaphor, he complains about how a real psychologist would have cost.
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Reference to the character Raymond, from the movie “Rain Man”. Raymond, plagued with autism, is a mathematical genius. He can calculate any math problem, no matter the scale, in his head, no paper, no pen, no calculator, just straight memory.