I'm doing my first flush..just drank my first drink of grapefruit juice and Epsom Salts . Didn't taste bad at all..which amazed me.
I think that if you have pain now, then why not go ahead and give it a try. Surgery I'm sure is not piece of cake and it's not a guarentee of good health.
Once you lose your gallbladder, you won't be growing a new one back.
So if horror of horrors a stone got stuck (highly unlikley) you can opt for the surgery then, or do another flush like most people here have done.