Feeling very tired with a vomiting sensation is often due to dehydration, a mild stomach upset, or not eating properly. Try sipping small amounts of water or other oral fluids frequently to stay hydrated, and take light foods like toast, rice, or a banana to avoid stomach irritation. Rest in a calm place and avoid strong smells or heavy meals, as these can trigger more nausea. Sit slightly upright instead of lying flat to feel more comfortable. Pay attention if you develop repeated vomiting or fever, or if you are unable to keep fluids down. Consult a doctor if the feeling does not improve soon or gets worse.