It causes vestibular symptoms. This creates the sensation of motion without movement.

Incidentally, if you’ve never had true vertigo, it is very disconcerting how much a sensory organ malfunction can affect your perception of the world. It is a kind of spatial psychosis that you can observe objectively.

Ddg for SSRI withdrawal symptoms.

I knew about SSRI withdrawal symptoms, even experienced "brain zaps" first hand, but never heard about the vestibular thing.