You have nothing to be sorry about, at the end of the day we are all trying to figure out what works for us and as everyone keeps saying we are all different which makes us all unique. Unfortunatley this does not solve our problems as to what will work for us and what won't.
I am a C and find it all extremely frustrating when trying to figure out out what works best for me. I must agree though that eating white rice does not work for me I end up with no BM's and as I am trying to lose weight this is not good.
I hope this some how helps, even if you can take just a little bit of comfort from it to know that you are not being a pain you are just trying to find your way with everyone else and all their support.