I'm not quite sure what is meant by "bile excretion". If you continue to have stomach pains, you may want to consider the various causes for this - such as gall bladder pain, ulcers, GERD, or inflammation of the stomach or esophagus.
An upper GI series or upper endoscopy would be the first tests to evaluate the stomach pain.
If there is concern about the biliary tree or gall bladder, an ultrasound would be a reasonable test to see if there are any diseases that could be affecting the biliary system.
I would also check your liver function tests to see if there is any elevation (which could be due to any damage to the biliary system).
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Thanks,
Kevin, M.D.