i get that too....its scary. I'm not sure but I think its just the brain overworked. I barely go on the computer (5 to 10 Mins at a time)...almost no tv (except my 22 min episode of Modern family...laughter is good for the soul!! I barely drive too...5 -10 mins each direction to the chiro.

I seem to get a flash of light off the left side of my head when I feel all the symptoms coming on...or sometimes early in the morning.