Well IBS isn't a "nothing" but it is a something that doesn't show up on medical tests that are designed to look for other diseases. There is a new test that actually looks at what is wrong with IBSers, but it doesn't change what treatment you will get.IBS is treatable. If your doctors refuse to try any treatments with you get different doctors. Lots of things we don't find a cause for (even if we can use a number to track it) and that doesn't mean they send you off with no treatment for high blood pressure even if they have no idea why you have it and can't test for it. (It is one of those idiopathic diseases for most people rather than caused by a specific thing).The "crazy" doesn't help make things better, but that doesn't "cause" it. Every single disease even if we can find it with a medical test tends to be effected by attitude and how good your mental and social health is.IBS is often fall out from damage caused when your body fights off a GI infection. Kinda like to replace the batteries in the remote you bonked it with a hammer a couple of times. You put fresh batteries in and it is "healed" but some of the buttons never quite work the same way ever again.It takes a huge amount of coordination for the GI tract to get things smoothly from mouth to anus and have the BM be "just right" (not too dry, not too wet). Anything that disrupts that coordination is going to cause symptoms.Now being on other medications may effect what treatments they can try but they don't have a picture of the damage doesn't mean untreatable or I'm just crazy and imagining the symptoms.