https://pmc.ncbi.nlm.nih.gov/articles/PMC3480686/
> Fate, which takes away healthy, free, young people, never pardoned me once. It has let me live all this time, quite lucid, but closed up in here ... since I was ten years old .... eighty years in psychiatric hospital for a headache
Take modern medicine with a grain of salt.
Surely you’re not trying to draw some conclusion between an entire countries modern day medical field and a theory a person proposed in the 1800s, right?
That would depend on whether anything has changed since the 1800s. But that's very clearly not so -- consider that recovered memory therapy (https://en.wikipedia.org/wiki/Recovered-memory_therapy), based on as much science as drapetomania, was practiced in the 1990s, and still has adherents today.
Also, for human psychology to be regarded as a medical field, it would have to be based in science. But human psychology studies the mind, therefore by definition it's not based in science.