I agree about the pain if it's gallbladder related though not sure about what the calcification thing is, I had gallstones and my gallbladder got infected, went nasty and had split by the time I had it out.
I know some people who just had one incidence then nothing since, though, as I say, that was gallstones.
I agree about the fatty food and would also avoid large meals too, anything that is more of a pain to digest. Nice simple non-fatty food in small amounts is good, I find chicken and rice good as an easy on the tummy meal.
I had buscopan for the spasms too and used codeine phosphate and diclofenac to help with the pain of attacks.