Don't want to comment on the flush / parasite process. But was wondering if you've tried;
Aloe Vera - for the IBS
Pysillium - for the diarrhrea/ runny stools.
Pysillium husk powder is best - it helps bind everything together. Works really well and helps with regulating bowel movements. You can mix it into most foods you eat during the day, basically it is tasteless so you won't notice it.