I cannot have soy milk, fruit juice, most things that are highly acidic,
and pears. (The pears are crazy because they say people with
IC can eat pears, well my body never read the info.) Also you might want to try a gluten and dairy free diet. (I was on one before the diagnosis) as IC does have an autoimmune component.
Whatever you do not let anyone perform the Potassium Chloride test (KCl test) because this test is only 70% reliable.