I do hope you look into other options before surgery, I have done 13 flushes with great results, it's a long haul but the right one I think. I didn't have any stones that showed up on any scans, so I presume I don't have calcified ones, sounds like you have, you may need to read quite a bit of info about crushing your stones first or just softening them with apple juice (I have eaten one green apple a day for quite a while now) before you do a flush, even a week of drinking huge amounts of apple juice will make a difference.
If you did flush you might even be able to keep your gallbladder minus the stones, wouldn't that be great, surgery should be the last resort, but sometimes it's the only way.
Best of luck in your decision, there is so much information on this web site you don't need to be un-informed.