Loc: Northern California
I suggest that you order Heather's peppermint double enteric coated capsules. They will get the peppermint down below the stomach where they can actually start working for you.
I'm glad you are having a colonoscopy to rule out polps or tumors. From there, all you need do is find what works for you, starting with the basic IBS diet and going from there. Do use the fiber (Heather's is best based on my experience), and also the peppermint double-enteric coated capsulses. You will be fine.
Believe me, Heather is not paying me to push her products. I just KNOW that they have worked for me and the organic acacia fiber will benefit anyone, IBS or not. Today our same foods are not as nutricious as they were 50 years ago, and they are full of stuff our bodies don't digest very well, and ultimately can cause us health problems. Really good nutitrition is lacking as a result.
Believe me Heather's acacia works!... IF you remain faithful to it.
My best to to you, and do not fear the procedure. It is actually very easy. I don't know why I resisted having such for so many years. Fear is a terrible thing. Do not fear, stay calm. The procedure is over in a breeze.