I am experiencing constipation. The following also describe me: Dehydration, Painful bowel movements, and Lower abdominal pain. What should I do?

Doctor can examine. Each person with constipation needs to be sure there is no other disease causing it. If constipation is just due to slow movement of the food and poop through the gut, then the things to try are vegetables, water, fiber with water, prune juice, prunes, polyethylene glycol, Senokot or other senna, milk of magnesia, other laxatives... A doctor can evaluate and may consider prescription medications.