I'd get yourself checked for celiac and wheat allergies BEFORE you try a gluten free diet.
If those tests are negative, see how you do with the IBS diet (which is inherently dairy-free) and with a soluble fiber supplement (info here) for the diarrhea/constipation. This may take care of your issues and you won't have to bother with going gluten free.
If you are wheat or gluten intolerant, you can combine that with the IBS diet - search the boards for past posts on this. But, I wouldn't bother to take this step until you've been tested so you know what you're dealing with.
And, if you're avoiding gluten and then you take a gluten tolerance test, you can get a false negative.
Best, Heather
-------------------- Heather is the Administrator of the IBS Message Boards. She is the author of Eating for IBS and The First Year: IBS, and the CEO of Heather's Tummy Care. Join her IBS Newsletter. Meet Heather on Facebook!
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Pretty much the same diet for both, and it's also dairy free...
