I get dizzy a lot, also. It's so bad that at times, I actually feel like I am going to pass out and think I actually have a few times!
When we mentioned it to my Dr, he said that my blood pressure was a bit low and that it was probably from the pain and was sort of my bodies way of 'coping' with the pain. For example, when my pain gets too much, I go dizzy and pass out in order for my body to recover. I guess it makes sense as I always feel worse when my pain is really high.
I agree with what the others said, please go and see your Dr again just to rule out any other possibilities. When you go to stand, stand really slowly too - don't rush up otherwise that will make you go even dizzier!
Take care and keep us posted!