Having a urine infection accompanied by fever and vomiting is a serious concern. These symptoms suggest the infection may have spread to your kidneys (pyelonephritis). Because you are vomiting, oral medications may not be absorbed properly, making self-treatment unsafe. You need to see a doctor immediately. They will likely perform a urine test and may prescribe antibiotics, paracetamol for the fever, an antiemetic (like Ondansetron) for vomiting, and an antacid (like Pantoprazole) for acidity. Please do not self-medicate; seek urgent medical evaluation or visit an emergency room right away.