Nausea after eating and pale stools are two signs that you are either not producing enough bile or that something (usually gallstones) are blocking the ducts and not allowing enough bile to be released. I don't know enough about Colonix to know if it is related to the product or a separate problem. One quick thing you can try is a coffee retention enema. Make some strong coffee (regular, not instant) cool to lukewarm and insert only one cup, hold this for at least 15 minutes, then void that and repeat. The retention enema allows the components in the coffee to be absorbed into the liver and stimulate it to release bile. After you complete two rounds of retention enemas you might want to do a regular saline enema to flush out the lower bowel. If this does not help, then you might want to consider a liver flush. You are pretty young, but I have heard of teenagers having gallbladder surgery because of stones; so it is a possibility.