....that's my thinking as there are different degrees and triggering conditions. Some people are fine in a room or car, but get unnerved in a lift or airliner cabin as they feel "sealed in" with no way out until the lift stops at their floor or the aeroplane finally taxis to the gate..
With Leela she was nearly buried alive when a building she was hiding in collapsed after it was hit by a rocket during the invasion. Moments beforehand, she saw her brother and mother get caught underneath a wall that gave way as they were trying to find cover in the panic. When her father went back to try and dig them out she saw him get cut down by an armed drone. Those were the last things she remembered until she woke up months later in the medical facility of the old underground bunker the resistance used as one of the operations bases.
Yeah, war is drek.