Stomach pain along with dysentery and weakness is commonly caused by stomach or intestinal infection, food poisoning, contaminated food or water, indigestion, or inflammation of the intestines. Dysentery usually refers to loose motions that may contain mucus or blood and can lead to dehydration and weakness if not treated properly. The most important step is to prevent dehydration by drinking plenty of fluids such as clean water, oral rehydration solution (ORS), coconut water, rice water, or soups. Eat light and easily digestible foods such as rice, bananas, curd, toast, khichdi, or boiled potatoes, and avoid oily, spicy, outside, or heavy foods until recovery. Rest is also important because weakness often occurs due to fluid loss and reduced food intake. Avoid taking antibiotics or anti-diarrheal medicines on your own without medical advice because the treatment depends on the exact cause of the infection. Some people may require medicines for stomach cramps, probiotics, or antibiotics if a bacterial infection is confirmed by a doctor. Maintain proper hand hygiene and drink safe, clean water to prevent further infection. You should consult a doctor if the symptoms are severe, last more than a few days, or if you develop fever, blood in stool, repeated vomiting, severe stomach pain, dizziness, or inability to eat or drink properly. These symptoms may require medical tests and specific treatment. With proper hydration, diet, and timely care, most stomach infections improve well.