I have not been diagnosed with IBS, but I have had heartburn, gas, bloating, indigestion after just about every meal for the past two or three years. A fun fact about me is that I drank from a mountain stream in 2012, I think, and got bad stomach ailments at the bottom of the mountain. I thought it may have been from the elevation or the water. I am sure now that it was from the water. I didn't vomit, but I have never been one to vomit much anyway, and I don't remember diarrhea, but that doesn't mean I didn't have any. I have always had a bad diet, sugar, carbs and meat were the staple in my parents house, fruits and vegetables rarely to be seen, besides canned or frozen at the dinner table. I still live with them, and they are unfortunately still living like this, refusing to accept my persistent assurance that we need ten servings of vegetables a day.

Anyway, more to the point, there is an IBS treatment center and they test for parasites, and it is run by legit medical doctors, not naturopaths, or TCM doctors etc. Not that I don't find their practices credible, the medical establishment does not, and to have this legitimate center checking for parasites and treating a case at least once ever two weeks is amazing, and a true leap in the medical treatment of parasites.

I wanted to let everyone on this forum know about this, in case someone is looking for treatment for their IBS from qualified medical doctors. I have not read much else on their site, having found this page while obsessively looking at things about parasites on google. However, I know that they acknowledge and treat candida and small intestine bacteria overgrowth, which I am guessing is pretty much biofilm.

They have centers in Santa Monica, California and Seattle, Washington.

This is a link on parasites and how they detect them, they use DNA testing, which is much more accurate:
https://ibstreatmentcenter.com/2012/06/understanding-parasites-2.html

This is a link to a general page on what cause IBS:
https://ibstreatmentcenter.com/what-causes-ibs