after my concussion i felt extreme tingling on the back of my head (that would get worse with walking). after a while it went away. however, when i try to run (or any physical activity that bounces), the movement of the back of my head up and down feels unpleasant and after a while starts to make me dizzy. i don't have any neck pain to indicate that it's a neck problem. cervical MRI clean.

anyone else have this or figure out what's going on?