What do individuals battling Migraines, Fibromyalgia and Motion Sickness

all have in common?  I have noticed that these problems all involve a tendency toward hypersensitivity.  Many clients with these problems also report being hypersensitive to light, movement, sound and touch.  It is as if their sympathetic nervous systems are overpowering their parasympathetic nervous systems and causing them to be in a constant state of fight or flight.