Been sick last 3 days with nausea and loss of appetite. started feeling somewhat better today and relapse with pressure at pit of stomach and gagging?

Nausea x3 days: If sexually active (even with contraception), check a pregnancy test. Nausea is very common early in pregnancy. Usually these things are viruses that pass after a couple of days. Unless you have fevers, worsening pain or bloody diarrhea, you can treat yourself at home. Stay well-hydrated with plenty of water or broth. Ginger could help settle your stomach.