I know natural remedies aren't typically well received, and I am even skeptical of lots of stuff I hear myself, but my mother had gallstones and all she did was drink a tablespoon of apple cider vinegar in a glass of water (you can use apple juice to help mask the taste) every single day. The gallstones eventually dissolved/no more gallbladder attacks. I believe there was also lemon & honey involved.
Just googling it, it looks like the above (and other options) are a good quick way to help reduce gallbladder pain so it might be worth a try to help reduce attacks/pain until the surgery.
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