From the little you've written here, it doesn't sound to me like you have typical IBS or perhaps even IBS at all. The diagnostic criteria for IBS are here: ht

From the little you've written here, it doesn't sound to me like you have typical IBS or perhaps even IBS at all. The diagnostic criteria for IBS are here: http://www.aboutibs.org/site/what-is-ibs/intro-to-ibs/diagnosis http://www.aboutibs.org/site/what-is-ibs/intro-to-ibs/diagno... Dramatic weight loss as you've outlined is a sign you're suffering from something more serious than IBS. That makes sense since you list several other non-IBS related disorders ("stomach flu (sic) / food poisoning" as well as gastroparesis). The thing that doesn't make sense to me is why you attribute these things to IBS? If simply upping my fiber solved the problem then I would be set, but fiber lead to more gas and pain for me. There is nothing "simple" about increasing your fiber in a manner to solve IBS. As I mentioned in my original comment, it takes actual work. First, you have to eschew eating anything at all throughout the day that doesn't have dietary fiber. Second, you must gradually increase your fiber intake over a period of a year to avoid gas buildup and pain. Third, you must actively seek out fiber rich foods to eat throughout the day. As I said, there is absolutely nothing simple about it. This all happened to me after I went swimming in a river with friends and got ill later in the evening. Again, I'm questioning why you think this has anything to do with IBS. You don't catch IBS by swimming in a river.