I had similar occurrence myself, different pain. However, the stool colour improved about 3-4 days after. If yours doesn't I would first try another flush. If you don't feel an improvement by about the 2nd day then see your health practitioner immediately and check your pancreas function. Pancreatitus symptom is yellow stool and can occur from blockage, blockage can occur from a stone being lodged in the duct. The duct to the Pancreas joins the common bile duct just before it exits into the Duodenum.
I did another flush after my second and experiencing those problems and my third made an overall improvement in how things were functioning. Note I was doing it likely for different reasons to you though.