Hello, dung3r, From your symptoms it sounds like you have acute inflammation of the lining of the stomach or even an ulcer. Think back and see if you ate any bad food like contaminated poultry or dairy products. If you used any pain killers like aspirin or ibuprofen or similar NSAIDS, they can cause acute inflammation. Especially,nausea, vomiting, pain worsening after food makes the possibility of Gastritis on top of the list. If you also start having dirrhea with this food poisoning is a distinct possibility. Try to stay on clear liquids like apple juice or white grape juice. Bland diet with rice, mashed potato, pasta without much seasoning will be O.K. if you can tolerate it. Take over the counter Cimetadine or Ranitidine or even Omeprazole twice a day till symptoms get better. If you continue to have severe pain, vomiting, you may need intravenous fluids and may be further work up to include blood ,stool and x-ray studies of your stomach. Hope I have given you what the possibilities are. I wish you well.