Adding oatmeal does a great deal for me even though I am never on the constipation end (ever). If I eat 2 packets of the instant oatmeal in the morning - it resolves most of the problem.
Other things that I have to do at the same time are - eat several times a day - smaller meals... the dietcian explained it to me - sorry can't really explain it back...
But it has to do with the "gut" response..

What she told me does work - if I follow it. The several small meals and the oatmeal...Another thing that also helps is to add calcium supplements - but only if consipation isn't a problem.. eliminating all artifical sweeters - including sugarfree gum.

I also agree that when I am really upset... nothing seems to work.. and the cramps can be unreal..