Explanation for Dizziness.

I have just read this article, well skim read it, can't read properly off the screen.  This may explain my dizziness and problems with standing up quickly.  I have a dizzy sensation most of the time, but go very dizzy if I stand too quickly.  My dizziness is exacerbated by movement eg being in the car or on a train and can be quite bad for several days after travelling.  It's ok whilst I am actually travelling, but feels awful when I stop moving.  Its quite bad today, maybe from being on my scooter a lot yesterday or maybe just from fatigue, who knows.