Lack of balance
Dizziness; frequent falls; vertigo (even when lying down with the eyes closed); feeling of inebriation; sensation that the body is oscillating; unsteadiness; instability when stepping; mal de débarquement; or nausea/sickness.
In PDS, these symptoms are believed to be cause by a dysfunction of the perception of the body i.e. of proprioception, and not to a dysfunction of the labyrinth.
Note, that in orthostatic position, the human body presents normal physiologic oscillations that are undetected by individuals, and do not have any associated symptoms.