Welcome to the IBS Forum.
If you have an obstruction isn't there something medically / surgically your doc should be doing???
If obstruction isn't the issue, have you tried the more natural approach... prunes, aloe vera, fiber, lots of water and exercise?
Zelnorm is good too. The only problem is that maybe more than half the people on this board, that have tried it, didn't have a good reaction. I, on the other hand, was on if for over 6 months and loved it. It really did help regulate my system. Unfortunately Zelnorm seems to lose some of its affect after a little while. Even so I still stayed on it for months because it was still better than nothing.
Definitely talk to your doc about
it if you are scraping the bottom of the barrel.