I made the decision some time ago not to let this IBS interfere with my life, to go back to eating mostly what I like, but in much smaller portions.
Had a massive flare up this weekend - was having a lovely afternoon pottering in the garden in the sunshine, and then relaxing in front of the tv in the evening. So what caused the sudden flare up of stomach cramps, a dash to the loo - literally a 5 min warning, I have no idea. Followed by 4 further quick visits over the next 12 hours. Back to the immodium, I absolutely swear by it. It also has the advantage of tightening the anal sphincter.
Not going to let it get me down any more - I'm learning to live with it, and just my lifestyle around it. Tears and food diaries have got me nowhere. A map of the nearest toilets helps a lot more.