33 weeks ligthheaded dizzy blurred vision.

yesterday I was sitting after eating dinner. got up out if the chair to drive my kids back to there dad's house for the night and I'm thinking okay I just got up too fast. the more and more I drove I felt weird. Like lightheaded dizzy having trouble seeing numb all over body feeling I looked at hubby and said something is not right. we dropped the kids off and I drank a bottle of water and he insisted on going to the er to check baby. we did and were there for and hour kicks fine heartbeat fine blood sugar 91 and blood pressure was normal they sent me home to rest still feeling same way today almost as if I'm floating.... any ideas? I feel silly calling the doctors if the er found nothing I mean they didn't check much...