I have not officially been diagnosed with IBS but after researching I have pretty much figured that is what causes me to always know where the bathroom is and not shop at places that do not have one. I was going 6-10 times a day, on a bad day with maybe one solid movement in 6 months if i was lucky LOL
I tried something I have used for my dog for years. If I change foods she gets the runs, and since I prefer to feed raw, changes happen with what meat is on sale today

I give her a probiotic called Acidophilus, in a granual formula, I get from a holistic friend. Even tho its technically for human use, its great for her! mix it in some yogurt and its gone. If you look in the vitamin section of most stores, you can find Acidophilus in pearl type pills, I prefer these over the granual type I use for Rumor.
The bottle says: Acidophilus is a friendly bacteria found naturally in the intestinal tract. It promotes a favorable balance of intestinal bacteria and supports the healty functioning of the intestinal tract.
It is OMGosh amazing!! You really have to try it if you have IBS or any digestive stuff going on. I have friends whom I have turned on to these and they are amazed also.