You might check on our Vitamin & Supplements forum for some natural/nutritional/supplements that might help.

Have you been able to figure out anything that sets it off?
stress ?
I tend internalize my stress and it affects my digestion quite a bit, but it's controllable. More like mild IBS tendencies.
Oh and it probably was mostly caused by high Motrin/Advil use while I was trying to stay working when I was developing severe RSI. {became TOS}