Hot flashes

We keep our home cold...but I get soooooo hot that i can hardly breathe. I get to where I'm about to pass out or so I'm assuming that's what it feels like. I get dizzy, vision blurry, and start puking. I'm 3 months now...I thought it was morning sickness in the first trimester but it's happened more and more lately. Anyone else deal with this or know what it could be?