I think I posted on your other thread - I'm a doctor but not a surgeon and I have had my gallbladder out.
My surgeon said as welshweasel has, that the only treatment is surgery. And frankly, having seen gallstone pancreatitis, including someone dying from it, myself as a junior doctor I was fucking terrified of it and wanted the blasted thing out.
My understanding was that the risk was higher if the stones are small as they are more likely to move out of the gallbladder down the duct and cause problems, while a big fat gallstone will just sit in the gallbladder causing excruciating pain while the gallbladder contracts around it.
From personal experience, no fat was any good at all while waiting for the gallbladder to be removed. There were no good fats, all of them caused pain but I did lose loads of weight
As others have said, it was doable as a diet, but no way to live in the long term as a diet consisting solely of dry toast, fruit, grilled fish and steamed veg day in and day out becomes grindingly miserable.
Surgery was fine, day case and completely back to normal within a week. You get told 2 weeks off work as standard.
Post surgery there have been no restrictions on my diet at all but if I do eat something really fatty - think gooseberry fool made mainly of double cream - I will get a bit of abdominal pain. Some friends who have had theirs out have said they might get some diarrhoea with very fatty foods but that doesn't happen to me. Basically we eat what we want with some v minor restrictions around treats but not so much that we don't eat them