At the basis of the FODMAP elimination/re-introduction approach is the assumption that you have removed common IBS triggers such as caffeinated drinks, high fat foods, high insoluble fiber foods such as whole grains, etc. These are the common sense thing to remove even using the FODMAP approach. The developers of the FODMAP approach were very clear about that (see third link in my signature) where they say
"If adherence was strict, attention may be needed to modify intake of resistant starch and insoluble and soluble fiber. Other dietary triggers such as food chemicals may need to be considered, as should potential factors such as caffeine, fat, meal size and regularity."
During the elimination phase it is recommend that you eat a gluten free diet. This is not because of the gluten but because the fructans in wheat can be a problem. The best way to eat 'wheat free' is to eat 'gluten free' -- the later automatically implies the former. After eight weeks you will re-introduce wheat into your diet and determine if you can or cannot handle fructans in wheat products. And if you can how much you can handle.
Heather's eating for IBS diet does not consider FODMAPs as this is a relatively new development that came about after she developed her guidelines which cover the basics very well. So it requires some juggling to use them both but it works well
There is no question that anxiety and stress can make IBS symptoms worse. However, they are not the cause of IBS just other triggers. SSRIs have been studied in clinical trials on individuals with IBS showing some success in some individuals. FODMAP have no effect on SSRIs
The dietary approaches
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Re: Need Advice...Lexapro and Diet questions
The developers of the FODMAP approach were very clear about that (see third link in my signature) where they say
