I'm glad you've already confirmed that it is IBS for sure and not complications from the gallbladder surgery. That makes things easier!
Obviously, DON'T listen to your doctor's diet recommendations Unfortuantely doctors are taught very little accurate info about IBS and diet. Seriously stay away from dairy - it's one of the worst triggers for most people (plus you don't need cow juice anyway... ).
I agree with Franny: you don't necessarily need to buy the books - there is soooo much great info on this site. Read all of it if you can. Start by clicking on "IBS Diet and Recipes" to the left there and reading all that. Then click on "IBS Books" and read that chapters that Heather has available for free there. Then move on to "IBS Supplements" and read through all that. ... well you get the point Make sure that you especially understand the difference between soluble and insoluble fiber! (which your doctor clearly doesn't if he told you to eat whole wheat! )
What kind of fiber supplement are you taking right now? What dosage did you start at? With fiber supplements you have to start at a low dose to help your body adjust to it.
FYI, I'm a vegetarian and I eat mostly vegan too. (I'd be totally vegan but I do have egg whites occasionally.) It's really quite easy to eat vegetarian and vegan with IBS since most of the IBS safe foods are already vegetarian/vegan and (I think) it's probably the healthiest way for a person with IBS to eat.
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Re: Johana/gallbladder removal
Unfortuantely doctors are taught very little accurate info about IBS and diet. Seriously stay away from dairy - it's one of the worst triggers for most people (plus you don't need cow juice anyway... 
). 
... well you get the point 
Make sure that you especially understand the difference between soluble and insoluble fiber! (which your doctor clearly doesn't if he told you to eat whole wheat! 
)
