i am pregnant and i have been getting really dizzy and everything turns white is it just hot flashes

i have been getting dizzy and things get white and i get really really hot and the only way it goes away is if i lay down and just let it pass...i and 5 months pregnant and this has been going on for a few months but tests come back normal and i eat just fine so its not that i am missing something in my diet...if u can help email me ****

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