When I cheated suddenly one time, I had the worse pains! I even went to the doctor and he thought I was having a gall bladder problem and sent me for a sonagram etc.

It was just that my body wasn't use the sudden influx of fiber I put in it. When I went back to my regular eating, it went away. But it still will happen if I change my diet suddenly.

I would check with the doctor if it is bothering you though.