What Causes Constant Pain In Lower Hypogastric Region Along With Spams?

37yr old male 248lbs,6'1"experiencing constant pain in lower hypogastric region accompanied with sharp pains/spasms lasting 5-15min or up to 45min to an 1hr. Cramps feel like something squeezing the intestines and trying to push something out the recum. This started 3-4wk ago, two weeks ago, patient ge gan having rectum spasms but had subsided. He also is experiencing dairrhea, loss of appetite, fatigue, and loss of weight, also unable to get confortable without causing more pain. His color is not good, pale even. He has had a colonscopy in 2006, with approx 4-5 polyps found, two being precancerous.