I've had iC for over 16 years. Tried the RIMSO and antidepressants, Elmiron (currently on), but it's NOT FUN. I will tell you that I have found about the best thing to keep it fairly under control is through your diet.
The Interstitial Cystitis Association has a list of foods to avoid:
www.ichelp.org and it consists of - Milk/Dairy Products: Avoid - aged cheeses, sour cream, yogurt & chocolate (ugh), Okay to try: white chocolate, non-aged cheeses such as cottage or American, frozen yogurt and milk; Veggies: avoid: fava & lima beans, onions, tofu, soy beans and tomatoes. Okay to try: other vegetables and home grown tomatoes (they tend to be less acidic.); Fruits: avoid: appleas, apricots, avocados, bananas, cantaloupes, citrus fruits, cranberries, grapes, nectarines, peaches, pineapples, plums, pomegranates, rhubarb, straberries and juices made from these fruits. Okay to try: melons (other than cantaloupes) and pears; Carbs & grains: Avoid: rye and sourdough bread. Okay to try - other breads, pasta, potatoes and rice; Meats & Fish: avoid: aged, canned, cured, processed or smoked meats and fish, anchovies, caviar (as if I eat that), chicken livers, corned beef and meats which contain nitrates or nitrites. Okay to try: other poultry, fish and meat. Avoid most nuts, okay to try: almonds cashews and pine nuts. AVOID alcoholic beverages, beer, sodas, coffee, tea, cranberry juice and wine. Okay to try: bottled or spring water, decaffeinated, and acid-free coffee and tea, and some herbal teas. Seasonings: avoid - mayo, spicy food (especially Chinese, Indian, Mexican and Thai), soy sauce, salad dressing and vinegar. Okay to try - garlic and other seasonings. Avoid benzol alcohol, citric acid, monosodium glautamate (MSG), Nutrasweet, saccharine and preservatives. Under Miscellaneous: tobacco, caffeine, diet pills, junk foods, recreational drugs (???), cold & allergy medications containing ephedrine or pseudoephedering and certain vitamins.
I laughed when it said "Although the list of foods to avoid may initially appear daunting, remember that there are still many foods you can enjoy."
I honestly thought my life of eating was over. Giving up caffeine was the worst of all. Now, I don't think much about it.
I will tell you that you will have to experiment over time to see what you tolerate better than other things. Because I can guarantee it isn't worth being up more at night than I do now. It is frustrating many times when traveling, but I just think that there's someone else worse off.
Good Luck - Darlene