Suggest Treatment For IBS And Painful Attacks

I suffer from ibs on an off,had a very painful attack 3 weeks ago which keeps returning.The last time i had the same symptoms i had stayed in a hotel and subsequently was diagnosed with food poisoning. It took 3 to 4 weeks to settle down to normal,could this be the same? I dont eat onions,beans,cauliflower and try to avoid many veg.as soon as i have eaten the pains return and i am uncomfortable.