I have had it for 8 years and it has gotten better. Pregnancy has seemed to help a bit. I can now eat foods that I haven't in years. Fried foods are the biggest problem, or extra greesy things, and cafeine too. So I just don't eat them! I lost a lot of weight. No more hamburgers, pizza, french fries, alfredo sauce, doughnuts, coke. I can't eat fiborous fruits and veggies either, so no apples or salads. Bummer. I took hyoscyamine and had no side effects, it worked OK. Also I take gas pills with every meal and fiber every day.
When I have a flare up it lasts for at least a day so I eat rice or yogurt. Warm things help and so does minty things, like mint tea or sucking on hard mints. 7UP seems to help too.
Food is my biggest trigger but stress doesn't help, but usually I flare after the stress is gone. When I flare I feel like I'm getting the flu, fevorish, aches all over, stomach cramps, running to the loo.