Hot flashes and nausea😰

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3rd pregnancy and I NEVER experienced this before!! I know it's pregnancy and every pregnancy is different but man oh man another 4 weeks of this seems almost impossible... Out of nowhere I get dizzy and a hot flash then bam I get nauseated to where I have to instantly lay down in a dark room with my eyes shut and focus on my breathing to hopefully not throw up and to cool down... Any suggestions on how to help stop this from happening?!? I'm getting desperate ladies!