I have extreme vertigo.. mine is due to vestibular damage. It was easily figured out by seeing a doctor who specialized in concussion therapy. Your inner ears are responsible for your balance, by sending signals to your brain.

If you have vestibular damage, the signals are incorrect, therefore your brain creates dizziness (my explanation).

Easy way to determine and help...do not look at a bunch of objects at once. If you are mobile, find one thing in front of you focus on that, then find something else until you get to your destination.

I will tell you, my experiences have landed me down the stairs, or walking into things.