Constant need to pass gas. over a year constipated. pebble type stool. sometimes larger stool. why?

Needs to be resolved: 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 things to try are vegetables, water, prune juice, prunes, fiber with water, Miralax, Senokot or other senna, milk of magnesia, etc... One's doctor can evaluate and may sometimes prescribe drugs such as Linzess or Amitiza.