Jenny-I'm no expert. The one way of looking at underlaying imbalances in the body that I have seen is metabolic typing. It makes a lot of sense to me.

Its hard with IBS (my dad has it, colitis and large intestines removed etc). My dad also has ME (chronic fatigue syndrome in Canada). He ran into a guy that claims he cured himself. He told me dad to go on a high protein diet (thats what worked for him). Though the chronic fatigue didn't disapear (I think there are many life style factors to consider) his IBS improved way more than it ever had and was better than from the get go.

My dad resently did metabolic profiling and it shows he's a protein type. Much of it is learning to listen to your body. He's always said he felt better on meat. Now the amounts and quality of protein I don't think where idea but the fact is he had great improvment eating according to his metabolic type (even though he didn't know thats what he was doing).

The Metabilic Typing Diet-William Wolcott and Trish Fahey
How to Eat Move and Be Healthy-Paul Chek

I think they are both worth a read to anyone, regardless of symptoms.