Feeling lightheaded

So, this is my 3rd baby and today while at work I got up from the chair and felt like I was going to pass out. That of which I know is normal and happened with both my girls too. But after that dizzy spell, the light headedness didn't go away. I have felt like a bobble head since then and have had a tingle in my hands and fingers since. I went home from work early and laid down, did the propping and such like your supposed to do but when I got up to get my girls at school the Lightheadedness came back. Called my doc and they said I needed to lay down and take it easy, if it doesn't go away by tomorrow then there could be something wrong with my blood pressure. But I went in on the 19th for my appt and my pressure was perfect... Anyone else dealing with this?