Does anyone have IBS flare-ups that don't seem to be triggered by food or stress?I've been modifying my diet for 8 years, since I started having IBS episodes. I know dairy causes episodes, as do specific kinds of stress, so I avoid them.But most of my episodes don't seem to be triggered by food or stress. They come when I eat exactly the same (non-trigger) foods I've been eating safely for weeks, and when my stress level is low and stable. What's more, after an episode peaks (within the first 12-24 hours) and I start feeling better, I can eat the same foods I ate beforehand with no ill effects; I don't have a heightened sensitivity to them while my intestines are still touchy.It's very confusing, and frustrating. I've had the usual tests -- blood, stool, colonoscopy, barium swallow with small-bowel follow-through -- and all come up normal. I'm not sure IBS is the right diagnosis, but my GI docs can't offer me anything better.I just want to find out what I need to change to stop these episodes from starting.