I have been having issues with major pain after eating and having diarrhea. pains feel like contractions while in labor. the diarrhea has a lot of clear mucus with blood in it. this has been going on for a couple of years. what can cause this?

Let me get this straight. You're been having these symptoms, including mucus with blood in your stools, for "a couple of years" without getting medical attention?? You likely have inflammatory bowel disease, either ulcerative colitis or Crohn's disease, and there's a slim chance of other serious problems. See a doctor soon, ideally a gastroenterologist. Good luck.