Lately I have awakened in the middle of the night with intestinal pain, cramping,, feeling like I need to have a bowel movement. It actually feels like the food is passing to the lower intestine. I m wondering if it is my diet, or do I have a tumor or what? It usually passes and I go back to sleep but when I wake up I have to have a bowel movement right away. I m also gassy. This is not every night, just sometimes.