Luv Your Liver
In a word: NO! Of course I am not a doctor, but if I were you, I wouldn't have surgery unless it was threatening my life.
Get ahold of some gold coin grass. That'll help.
People have gotten stones out that are that big before. Definitely not unheard of. But, GCG is supposed to break up stones. There are several other things you can do, but if I were in your shoes, I'd consider it a challenge; one that can be overcome with some diligence. Fresh pressed apple juice can help soften stones as well.
If you are really concerned, go to Andreas Mortiz's forum and ask him what to do. He is the gallstone guru IMHO. His wife has gotten out some honkers herself!
Best wishes.