What would make a person nauseas and feel sick to their stomach everytime he eats?

Questions for doctor. Are symptoms related to all foods or only some foods? Is the volume or temperature of food a factor? Do your symptoms occur with every meal or only later in the day? Do you have associated symptoms of nausea, vomiting (with or without blood), biliary colic, tenderness, stool urgency with meals, blood or melena in stool? What can you do to resolve the symptoms? Could you be pregnant? Under stress?