Yep, been there, done that. Extrememly painful attacks which escaalte if one of the stones gets stuck in the bile duct. They are hard accretions of bile salts & as far as I'm aware the only long term solution is to have your gall ballder removed. It's usually done as keyhole surgery in which case you'll be up & about in a day or so but if they have to open you up you'll be laid up for at least a couple of weeks.
My surgeon gave me mine back in a pot: