Hi there @kalbran1 and welcome to Mayo Clinic Connect! So glad you do not have any any food allergies because mixed with IBS and tortuous colon can definitely exacerbate that.
You will see that I moved your post to a long standing discussion about tortuous colon and a lot of members talk about IBS as well as pain. I encourage you to read over the multiple pages from these individuals so you can connect with them.

When they did the colonoscopy, did they mention a build up of stool at all?