If you google "liver flush scam", you can read about how these things work, including articles by surgeons who have looked into it. There's plenty of proof against it, and no proof at all that it works. Basically, the olive oil saponifies in your body and forms little green pellets. Proponents of the liver flush never seem to know how small the gallbladder is, and always claim that they have expelled far more gallstones than would fit in a gallbladder several times over. If you have real gallstones, then swallowing that much oil is very dangerous as it could trigger a real gallstone attack which could lead to a gallstone getting stuck in a bile duct and causing infection. Even if you don't have real gallstones, it's a bad idea to consume that much oil in terms of heart disease and the like. A nurse friend of mine was horrified when I told her that people were urging me to do this. It is alarmingly popular for people to be bullied into avoiding essential medical treatment in favour of fraudulent remedies - I've even had someone spend a long time trying to bully me into trying the olive oil treatment a month after I had my gallbladder removed.
If you think you are having a gallstone attack, call a doctor immediately. The pain is extreme, and I don't mean pain that "barely allows you to sleep" - you have no chance of sleeping through a gallstone attack, it's more painful than childbirth and often causes other symptoms such as hypothermia. If you can't get to a doctor, it's probably a good idea to go to A&E/ER. Gallstone attacks happen when the gallbladder contracts and a stone is forced out. The stones tend to be wider than the bile duct (which is only 3mm), so it is horrendously painful for them to travel through it. Sometimes they get stuck there, and that's when it can lead to infection and be life-threatening.
Please also remember that most bile is produced by the liver. The gallbladder is just there to provide a little extra squirt of bile when digesting particularly large meals. It's left over from the "feast or famine" days of earlier humans. This is why humans can get on absolutely fine without a gallbladder, now that we eat not only every day, but several times a day. If you already have a gallbladder chock full of gallstones, then it is no longer functioning, and it cannot go back to normal even if there were some way of safely removing the gallstones without harming the gallbladder. There is a pill treatment they sometimes use on people who cannot tolerate surgery (I think only in mild cases too), but it takes a very long time to work, has a high rate of side effects, and the gallstones come back most of the time, so it's actually harder on the body in many ways than simply having the surgery. Any other ideas - shockwaves, "zapping" the gallstones, pouring olive oil at them - are a myth, they don't work.
Anyway, if you seem to be having gallbladder problems, call a doctor, and do NOT mess around with olive oil. You actually need to be on a very low-fat diet if you have gallstones. If you think it may be your liver, then get your liver checked out. It's not difficult to run a liver function test.
