If you're still having problems with C, you may want to look into an elimination diet. Gluten causes mild C for me (my reactions are neurological), but other foods cause it much more so. Brown rice gives me horrible stomach pain and worst C ever. Too much fructose and dairy causes C for me, too. Interestingly, other foods cause D, like things in the sorbitol family.
I did the FODMAP elimination diet, but I had to figure out the brown rice thing on my own. Also, brown rice didn't cause such a large reaction until I had been gluten-free a few months.