Yes, when you are IBS-D and C, that is called IBS-A which stands for Alternating bouts of constipation and diareah. Some people are IBS-A but lean towards either D or C as their predominant problem. Definitely get Heather's book and devour the info on this site as much as you can (not just the message boards...go to the home page and read through all the FAQs, info. on soluble/insoluble fiber, and so on.) No matter which IBS you are, help is here...you will just need to note how Ds and Cs follow the diet and use supplements slightly differently.
-------------------- Originally IBS-D for a million years!
Then IBS-A, Now a transformed slightly C