Could be anxiety. My sisters heart use to race away and she would get light headed, get sick at the stomach and she would go to ER and by the time her turn would come up to see a doctor, she would have been feeling fine and went home. One time they took her right in and everything was out of wack. They could find no reason why all that was going on and I told her to tell her doctor I thought she was having anxiety attacks... That was when I was living with her and soon as I would leave to go to work on the boat, she would have one.. She never had one when I was at home. Our Mama was dying of cancer at the time and she was left alone to take care of her while I was gone. They put her on anti anxiety meds and she hasn't had them anymore.

Having had them myself, I know how weired they make you feel and at first, they scare you to death because you don't know what it happening to you. I also know the fear of giving birth and could see how that would cause anxiety if you already have a phobia with seeing doctors. Just try your best to relax (easy to say, huh?)