IBS worse during pregnancy

Hi Dr. I was diagnosed with IBS when I was 15 years old. During my first pregnancy it didn't bother me at all but this pregnancy it is definately hitting me hard. I end up in so much pain that I feel like I am in heavy labour. I have not been able to pin point what causes the spasms but it is happening quite often.

Is there anything that you might suggest to help make this pain stop? I almost end up in tears because it is so intense. The good news of course is that the pain is gone once I produce a good BM.

Thanks for your time:)