Flush using Hulda Clark s method. You can find the recipe on this site. Use cold pressed olive oil. It should say Extra-Virgin Olive oil on the bottle.
I would cancel the meeting with surgeon or at least postpone it untill you flush. Most likely you will not need to see the doctor after flushing.
Don't discuss flushing with your doctor. Many people here have tried it but it did not bring them anywhere. Your doctor will most likely persist on removal of your gall bladder, and try to scare sh..t out of you by telling you that you have stones and they may stuck. Because he has direct interest in it. It is a well known scenario of such meetings and have been discussed here much.
Give flush a try before you make any decisions, please. You will not regret it.