I'm sorry, I've been on arimidex for a year and a half and haven't felt dizziness from it. Are you sure it's from that? First I'd say to notify your doctor of your problem and let him rule out other causes. That's always safest.
Also, move slower if you're prone to becoming dizzy. I get dizzy when getting up too fast all too often. Maybe the other members have some advice. Good luck!
"Our greatest glory is not in never falling, but in rising every time we fall." -Confucius
Don't knock on Death's Door. Ring the bell and run. He hates that.