Second, either you are in denial or you are a glutten for punishment. (This coming from the girl that went out to celebrate her official IBS diagnosis and the end of a million tests to determine this by going out and indulging in ribs & chicken with a side salad, washing it down with a few margarittas. Oh yeah - three months AFTER I discovered Heather's books. )
Anyways....how do you know you have IBS if you've had no tests? Anything at all? Bloodwork? Anything? A few words seems a little weak for a proper diagnosis.
As for triggers - they can come instantly or a day or two later. For example, if I eat anything dairy or fried, I'm having an attack before I've finished clearing the dishes. If I eat raw veggies, I'm having an attack the next day. It all depends on how your attacks come if you want to schedule them.
You could also make some adjustments on some of your things. For example, I can tolerate hull-less popcorn if I'm stable and have had a good safe meal earlier. You could also have baked potato chips (Lays) or baked Tostitos. You could also have soy or rice ice cream instead of regular. I haven't tried them yet, but I've read a lot of posts on Toffuti Cuties.
Well, was that a polite response? I hope so, because I can't stand rudeness.