18 weeks here and everytime i stand up i feel like im gonna passout. I slowly start getting more and more lightheaded to the point i feel like im loosing my vision and my heart starts racing. I have fallen a couple times because of this but ive never completly lost conciousness, everything just slowly goes dark and i feel like im floating with my heart pounding in my ears. I didnt have this with my other 2 kids. I try to drink lots of water and eat healthy. As soon as i sit down i start to feel better just feel so tired after. Its affecting my job and i cant get anything done!