Thanks for the advice. I was taking acacia only once in the morning at breakfast and gradually increased my dosage but realistically I think I might have been having too much at once (was having 3 heaped teaspoons!) I've backed off to one level teaspoon and a bit of a morning and will try taking some at night before I go to bed and see how that goes.
I tried Metamucil about a year back - never again!
I still think that there are some foods that are causing problems (other than the obvious ones like milk, eggs and onion etc). Maybe I'm getting too much fructose or something? Anybody had any experience with this?