ditto it does sound like ibs..
I had of this type once..the ibs pain was exactly like menstral cramps. Was like that for a while and was getting desperate. I got rid of it by modififying my diet, that is i started to eat low fat and less red meat. It really went away.
Never suffered from ibs again til now damn it and Im still trying to point out what could possibly be this time. I hope i can get rid of it!