I had to stay home sick yesterday because of extreme dizziness. You should call your doctor to be on the safe side. Mine made me go to the pharmacy to make sure my blood pressure wasn't high so I wouldn't have to go all the way into her office.
I'm doing better today but still a litle dizzy. They told me in the mean time to drink a TON of water and make sure I'm eating every two hours. It's the pits, I'm sorry you're dealing with this.