I really think you should include the olive oil for maximum effect. The reason why you likely had the attack while eating olive oil crisps is in fact because of the olive oil. You see, the olive oil is a fat (a good one for the liver at that), but a fat none the less. When you eat a fat, this signals for the release of bile. When the bile got released, a stone got stuck somewhere and you had the attack. Taking the olive oil during a flush will not produce the same effect because the bile ducts will be dilated and enlarged, thus allowing the stone to pass through without getting stuck. The olive oil is what "pushes" the stones out (well the bile pushes it, but the olive oil stimulates the release of the bile) and the Epsom Salts enlarge the bile ducts.