I Have A Lot Of Gas And My Stools Are

I have a lot of gas and my stools are sometimes not normal. I have gone to a GI doctor and we have done some testing. He didn't find anything wrong and labeled it IBS. I tried FODMAP eating plan which helps some but I still get a lot of gas and as soon as I try other foods not on the FODMAP my stools change again. I'm reading lots of books on this, but there are so many possibilities, I need more help. Laurie