I have this problem too. It's really, really, really, really annoying and frustrating. I got tested for a yeast overgrowth, and it came up negative! I was convinced that I had a yeast overgrowth. The test did show that I had a lot of this 'bad bacteria' and very little of some 'good bacteria'. So, I've been taking stuff for it for about a month with no changes. It's really annoying. I know what makes my bloating worse is nutrasweet (diet soda, sugar free icecream, etc.) and also when I get heartburn.
Tori