Over the past few years GI researchers have developed a new dietary approach, the FODMAP approach, for managing functional GI disorder such as IBS. Clinical trails have shown it is quite effective for managing symptoms such as pain. You can read more about in the first two links in my signature.
I have been using the FODMAP approach along with a modified version of Heather's Eating For IBS diet. I have managed to reduce the pain I experience significantly this way. Perhaps it is something you might consider.
-------------------- STABLE: ♂, IBS-D 50+ years - Science of IBS
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Another approach for managing IBS symtpoms including pain
