I'm also from the Bay Area, although I'm all the way down in San Jose. Do you have Kaiser as your health coverage? They have actually recommended Heather's books to me (although I already knew about them at the time) and have been really helpful with my IBS. My aunt, who is a psychiatrist, has also told me they have a great IBS program, although I haven't see it. I was going to get more details but then had to switch insurances (long story).
Just thought I'd share that with you if you are fortunate enough to have Kaiser. And yes, we are fortunate in California to have access to a lot of health foods.
Belinda had some great advice for you, as did lots of other people. Please remember that everyone is different, though. So what may have worked for one person might not necessarily work for another.
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Advice from another Bay Area IBS Sufferer
And yes, we are fortunate in California to have access to a lot of health foods. 
