My head spins when I stand up suddenly while I'm at work. Is this normal?

Head. Could be your dehydrated or your blood pressure is low. See your doctor and have them check your pressure seated and standing.
NO. This can come from inadequate fluid intake, anemia or other reasons why your blood pressure may be running low. Increase your fluid intake and maybe a little extra salt for now. See your physician for blood testing and physical exam to make sure you don't have anemia or other problems.