How can i stop myself from feeling nauseous? & throwing up?

This past week until today i been throwing up. Everything i eat or smell gross i throw it up. There's a slight chance i might be pregnant. My period is due on Tuesday but comes couple days early and hasn't showed up yet so if it doesn't come this week i will test. But im just worried because Friday i threw up at work and got send home and im afraid i may throw up again. Any advice?