Now matter how much water and fiber i take, i'm always dehydrated, causing my stool to be hard and dark. solutions ?

See your doctor: This problem can only be solved by seeing your doctor and being evaluated face-to-face. After a thorough examination, your doctor should be able to tell you what's wrong and what to do about it.

Be seen: There are several medications that can help with chronic constipation, though you should keep drinking copious amounts of water and take your fiber.