I don't know much about this condition, but I take a product called 5-lac to help with my digestion. It is a sachet of powder that you drink dissolved in a little water and it contains all kinds of "good bacteria". It is a lot better than these drinks that you can buy so I'm told (cheaper, less sugar, much higher concentration of pro-biotics etc.)
Keeps my (othewise slow) sytem working.
Somebody told me that peppermint was good for IBS....you can buy tablets or drink peppermint tea. Fennel tea is meant to be good too and it tastes quite nice. If you try these teas, try to get the Twinings ones...they seem stronger and better than others I have tried.
WS