You have to keep trying things, there are a lot of different ways of doing things and everybody is different.
You might consider doing liverflushes and bowelcleanse. Since I am a follower of Andreas Moritz I use Oxypowder (or colosan, oxyflush) other people use info from Clark, Schulze or Ask Barefoot.
In my notes I have this info about someone who had Gallstones and IBS.
//www.curezone.org/forums/m.asp?f=73&i=985
This is an interesting discussion about colon health and you will see you might need the liverflushing so you create more bile for digesting.
//www.curezone.org/forums/m.asp?f=337&i=12699
There is also a lot of information at the FAQ at both forums.
If you need more info about digestion check this website http://ener-chi.com under Healthinfo gallbladder/liver/intestines. In one of these three it will say that you need bile for digestion in the small intestines.