The 19 percent is the percentage of bile which exits from your GB when you eat a fatty meal. you don't have gallstones, but your gall bldder is not functioning very well. I would ask the dr the following:
Do you reccommend removing the gall bladder?
What are the complications of removal?
What is the likelihood of problems with the bile duct afterward?
What is the percentage across the general population of this happening?
Do I have additional risk factors of these complications happening to me?
What are my conservative treatment options?
If I have the surgery right away, will i still be able to go on my vacation?
Can you give me anything to help me be more comfortable until the surgery?
I hope this helps. Good luck!