Your symptoms of stomach pain after eating and mucus in your stool could point to Irritable Bowel Syndrome (IBS), dietary intolerances, or mild gut inflammation. Since these symptoms have lasted for 5 days, it is important not to self-medicate with random digestive drugs, as the wrong medicine could worsen your condition. I recommend keeping a food diary, eating smaller, low-fat meals, and staying hydrated. Please consult a doctor or gastroenterologist for a proper physical evaluation and stool test to determine the exact cause and get the correct prescription.