Hello! Thank you for the query. Your vomiting can be caused by viral infection. This is the most common reason of such symptoms. Fever, fatigue appears due to inflammation and dehydration. Usually it takes couple of days for the condition to improve. So if your condition is getting better, you will be fine and no medical attention is necessary. Just drink plenty of water and have mild diet for few more days. But if this is not the first time, and such symptoms are recurring, you should see a doctor. In such case, stomach disease(like peptic ulcer), gallstones and many more can cause such symptoms. Hope this will help. Regards.