Hi thanks for asking question. Had you taken any outside food in last 4 to 5 days??If yes then your vomiting and stomach pain might be because of food poisoning by bacteria or virus. So here first possibility is bacterial or viral gastroenteritis.It is better to take antibiotic for few days.If needed iv infusion of normal saline with antibiotic can be given. Meanwhile take following precaution -avoid smoke -small meal at frequent interval taken -green leafy veg useful -avoid spicy and fatty food -avoid alcohol -more water Here these symptoms can be because of ulcer in stomach.for that omeprazole taken. If still symptoms increasing I would like you to suggest for further investigation with endoscopy or ultrasound. I hope your concerned will be solved by my suggestion. Regards; Dr.Parth goswami