Has anyone ever gotten a little dizzy when your dentist raises your chair back up ? It only lasts a few seconds but I was wondering what was causing it to happen :)
You might want to check with your doctor to see if you have vertigo.
Probably orthostatic hypotension.
It could be because you've been laying down, and when the chair is raised, you are suddenly getting more blood to your brain. Sometimes called a head-rush. Best thing to do is just stay upright in the chair for a minute or two before getting up and walking away. If it happens frequently, and in other circumstances, you should discuss it with your doctor.