When you have whiplash can you hurt yourself more by moving your head or making moderate to sudden head movements? is it normal to feel some neck/head tension and pressure?

WHIPLASH: "Whiplash" means things, but does comport with a neck injury with forceful movements of the head upon the neck. If the neck injury is severe enough to contain fractures, disc herniations, tears, etc (beyond a limited strain/sprain), then one could make oneself worse (both in symptoms and in underlying structural injury) with moving the head (suddenly or otherwise). Tension/pressure are typical.