Nausea and vomiting after a recent fever usually happen because the stomach is still sensitive and weak during recovery. Try taking very light meals in small portions, such as rice, toast, or simple soups, so your stomach can adjust slowly, and sip water or oral fluids frequently to stay hydrated. Eat slowly and avoid oily, spicy, or heavy foods for a few days, and rest in an upright position after meals instead of lying down to reduce the urge to vomit. Give your body time to return to normal, and gradually reintroduce normal food as you feel better. Notice if vomiting continues, worsens, or if you are unable to keep fluids down. Consult a doctor if the symptoms do not improve or become more troubling.