Try to get a colonoscopy done to check your colon. By the meantime you will get a colon cleanse that is good. I did have one done. I was under anesthesia, It was not that bad. I only have twisted colon.
Lactose intolerance can give that symptoms and also food intolerance. I am there too. I have to avoid milk and everything prepared with, any food that have preservative or canned. I can only eat natural food or cook for me. I drink plenty of clean water and avoid also soda. It doesn't sound easy way but I want to live happy and longer. I don't have any complain. By the way, when I did my colonoscopy, the doctor didn't give any recommendation or explained anything about twisted colon. I am listening my own body and avoiding the food that make me sick like a dog. You can write down ( in your own privacy) what you eat everyday and when you go to the bathroom. It sounds silly but it helps. I still do it.
Be careful about patriot's claim. There are a lot of quacks on the internet. Patriot's post sounded like quackery the moment I saw it. A lot of claims, with very little support. Also, the book is written by a single author, who is just pushing forward his own theory.
Scientifics facts, are agreed on by all good scientists, and become established after hundreds of scientific experiments done by many independent groups. A single doctor, who has made up a theory himself, and written a book about it, is not science. If what the author claims is true, you should be able to finds the same information in university textbooks for medical students.
I have had symptoms similar to yours, and realized that it was due to lactose intolerance. I usually look at the symptoms of every condition on webmd.com to see what the most probable conditions are. But I'm not saying this is what you have, cause I really have no idea.
Also, the book uses testimonials and sales to support the success of the theory. Testimonials are meaningless without a control group. Sure maybe a hundred people by coincidence got better by following the diet in the book... but nobody's counting the thousands of other people who didn't get better. That's why scientific experiments with control groups are necessary.