I Feel A Bit Dizzy Once In A While, Particularly

I feel a bit dizzy once in a while, particularly if I quickly stand up from being bent over, or turn my head quickly. Also, some days my fingers are becoming numb, particularly middle to pinky. I am 66 and I do take nexium for ulcers, when needed, and Depakote for epilepsy - 500 mg a da. Thanks.