Diarrhea lasting over a week with stomach pain and bloating may result from dietary changes, supplements like magnesium, or mild infections. Monitor hydration closely and avoid irritants such as caffeine or fatty foods. If symptoms persist beyond 10 days, worsen, or include fever or blood, consult a doctor for evaluation. Keeping a symptom diary and noting any new exposures can help guide diagnosis. Managing nausea with small, frequent meals may also provide relief.