It could be intestinal candida reacting to your new found bile flow (which may have been occluded for yeeeears). Enhanced bile flow fights off candida due to its alkaline properties.
I normally don't need a colonic after a liver flush. The Epsom Salts really flush everything out. Just do an enema to save money, or look into like you were thinking of some activated willow charcoal or intestinal formula # 2. Have you had mercury Amalgams before? you could be reabsorbing heavy metals.