Can your period cause you to have a fever and throw up? I know this might be weird to talk about but I threw up on Friday, had a fever and felt nauseous all day yesterday, and today started my period. Yesterday I had cold chills and then I'd be incredibly hot. The fever went up to about 100.4 degrees F. I slept a lot more than usual because I was incredibly tired and weak feeling. I still am having hot flashes today but the fever is gone. I'm in a lot of pain today. Could this all be because of my period? Or does it sound like a virus alongside my period? I've never had a fever or thrown up with my period but I usually do have a lot of pain.