hello there
i suffer from ulcerative colitis which i only developed after the birth of my son. it has been very challenging and i know sufferers with IBS can encounter many of the same issues.
look into the specific carb diet. it has helped thousands of people who have issues like we do. it is very hard, and not a very fun diet. but if you are really suffering you will be willing to try anything. it is balanced and you will be able to get everything you need for pregnancy and also breastfeeding if you plan to do that.
like one other person mentioned, the diet incorporates yogurt (a homemade one with very low lactose content).
it is worth a try. but with ibs you really have to listen to your body and see what works.
have you seen a specialist? my general dr told me IBS but the specialist he referred me to did a much more complete exam and found colitis which is treated in a very different way. and you have probably ruled out things like parasites or bacterial infection...
definitely try probiotics (there are many different kinds) and also try digestive enzymes. these things work for many people and are safe for pregnancy.
feel free to contact me if you want any more detailed info. i have lots!
hope you feel better soon!!