Passing out? (15 weeks)

Anyone else almost or actually passing out? The other day I was at a friend’s house getting ready to leave and I started seeing stars till all my vision was white and I was woozy and sat down to eat and have some water and was shaking uncontrollably. And now every time I get up I get really light headed and I’m kinda worried it’s gonna happen again while I’m alone (which is 99% of the time). I’ve tried eating more and drinking more water and it doesn’t seem to change the dizzies.