My recommendation is to speak to a dietician about your diet and/or a homeopath for alternative remedies/relaxation. Had far worse than IBS (try IBD & IBS together) but the symptoms and causation/ part causation (in dietary/stress terms) can be much the same.
Soda Bread, yoghurt, imported live culture from Holland (specialist provider), Yakult, Porridge with Honey and potatoes were a godsend to me. Bottled Aloe Vera is great as a supplement. You may have to experiment with foodstuffs or try an exclusion diet for 3-4 weeks to weed out any dietary issues (start on just one foodstuff, e.g. porridge, then add another one every 24-48 hours until symptoms return to spot problem foodstuffs). It's a pain but well worth it. Fortunately I no longer suffer as major surgery removed that problem altogether, it just gave me others to worry about!
The downside for me was I had to avoid anything that could involve fermentation in the bowel, so bread, caffeine, wheat products with yeast, biscuits, refined foods and any yeast based product (no Beer Aaaarggghhh!) was out.
On the plus side it makes you very aware what you eat and you are forced to eat healthily - the weight dropped off me when I had to change my diet.
Best of luck. Let us know how you get on.
