The only way I was able to get rid of some of my IC pain and discomfort was by following (strictly) the IC elimination diet. Now just because I followed this diet doesn't mean that I did not have cravings for sugar and all of the foods that weren't on the approved list. In fact, the more sugar, yeast and bacteria that I removed from my body the worst I felt, and the more intense the sugar cravings became. Some days it was pure hell having an intense sugar withdrawal headache knowing that I could not have some chocolate to ease my discomfort.
I eventually approached my healing (and being on the elimination diet) the same way that drug and alcohol addicts deal with becoming clean: acknowledging that it is a painful process which CAN be accomplished through self will, support and knowing that it is a step by step process. Daily affirmations about proper food choices, supplements and increasing water intake can go a long way to help along the path towards health. Avoiding places and situations where sugar (and non-IC safe foods) might be around is another way to prevent eating something you should not and then dealing with an IC flare. Prevention is so much easier to deal with then trying to soothe a bladder/vagina upset by eating junk food.
IC is not an easy disease to deal with. It can be incredibly depressing to deal with the food issues in addition to the pain and other side affects. Please find an IC support group, friend or family member to help you meet your nutritional goals to support your IC symptoms. And eventually those "cravings" will be distant memories.