For constipation with mild stomach pain, you can try a gentle over-the-counter osmotic laxative like Polyethylene Glycol or a stool softener like Docusate Sodium. Increasing your water intake and eating fiber-rich foods can also help. Avoid strong stimulant laxatives (like Senna or Bisacodyl) initially, as they can worsen stomach cramping. If your pain is severe, persistent, or accompanied by vomiting, fever, bloating, or blood in your stool, please do not take any laxatives and seek immediate medical evaluation, as these could indicate a more serious condition like a bowel obstruction.