I have IBS. I think it's a junk diagnosis when the dr. can't find anything else. I had every test there was and they couldn't find anything. However, I lost 33 lbs in about 3 months and was deathly sick. I ate nothing but white rice and fat free chicken broth. Now I'm on an anti-spasmodic (levbid) and prozac and it's mostly managed. Of course immodium when needed - which is alot lately since stress makes it worse.
You need a dr. that will stick with you until you feel better or your symptoms are managed. Because if it is IBS it can really screw up your life -
a co-worker has been taking a chlorestral lowering drug for his IBS - prevalite(?) and it has helped tremendously.