This is less of a question than a wish to share an experience. I "cured" myself of intersitial cystitis by following the IC diet from ic-network.com. It's a list of food and drink to be excluded. I started by excluding them all but within a year I found I could have everythiing except tea and coffee. Caffeine and Tannin are the main irritants for me. I am symptom free. No pain. No urgency. No getting up in the night and all this without drugs or surgery. I had IC diagnosed in an unpleasant test involving a camera but it was worth it because once I had a name, I googled it, which led to the cure. The GP had never heard of it and the Urologist was cautious in suggesting it would help but it completely did for me. I am mentioning it here because IC is an auto-immune condition.