Please do not self-medicate with strong painkillers or antibiotics, as they can mask serious conditions like appendicitis or further irritate your stomach. Your symptoms, abdominal pain, vomiting, and fever, point to an underlying infection or inflammation that requires a professional physical exam. For now, focus on staying hydrated by taking small, frequent sips of water or Oral Rehydration Salts (ORS). Avoid solid foods until your vomiting subsides. Please visit a doctor or urgent care clinic immediately for a proper diagnosis. If your pain becomes severe, localises to the lower right abdomen, or you cannot keep any fluids down, seek emergency medical care.