I've stopped eating out (anywhere!) because of the same problem. I eat, my intestines start running full speed, and within a matter of an hour, I'm on the toilet, sweating, cramping, crying and cursing!
I've heard that a medication called Questran can help folks with IBS after gallbladder removal. You may want to check into that.
Also, I've found that when I eat, if I eat bread or rice before I start eating my meal, helps considerably. I DO NOT eat salads, fruit or veggies unless I'm absolutely craving them, and know that the bathroom is free and stocked up with toilet paper!
Barefoot