Are there any natural or herbal remedies for treating ibs?

Individualized . Approach. There are many causes that may include: stress, hormones, infections, inflammation, structural to name a few. Best is to work together with a gastroenterologist to arrive at the correct answer for you. Everyone is different and there is not one straight approach. You may start with as simple as an elimination diet and record which foods may aggravate you. Best wishes!
Ultrainflamx. Metagenics has a researched product called ultrainflamx which helps with ibs. The other meds that help - l-glutamine upto 15gm per day, lecithin powder, galactan powder, limonene 3 drops in water or juice, butyric acid capsules 2-3 three times per day.