I find it really interesting to see what food triggers folks have - when I asked my doc about caffeine, he told me that it wasn't the caffeine that was the issue - it is the oils found in the beans. The same is true with chocolate and colas.
We used to travel with a large performance group and be given box meals. Before I knew the deal with the cola and chocolate, I would skip the box meal (usually something greasy

) and have a diet cola and a candy bar. Good move

- this was like throwing gas on a fire
Once I found out how bad this was I began carrying my own bottled water and plain bagels and crackers with us. Life became MUCH easier.
I avoid all fizzy drinks, not just colas when traveling. I also avoid all cold drinks - I drink room temp water and room temp teas. Love the looks I get when I ask for iced tea, no ice. Oh well, it keeps my tummy happy.
I completely understand the mental part - panic attacks are brutal with IBS, but I am getting better about that since I know what my food triggers are. I have also discovered that I flair up on travel days when we take flights in the wee hours of the morning. I know it sounds odd, but when I have to get up at 3 or 4 in the morning, my system just knots up. If we fly a little later, I am fine.
Here's hoping we can all find the right solutions for our IBS issues