Don't worry, I know there's alot of info, but you don't need to learn it all at once! Take it one day at a time, try the next right thing, and before you know it, you'll be feeling better.
BTW, some of us here have something called fibromyalgia. Many people with it also have IBS and vice versa. Dry mouth and headaches can be associated with it. If you do a google search you'll learn more, but why not hold off on that and just work on your IBS first.