Every so often my stomach distends massively and painfully. My abdomen increases in circumference by about 10 inches. It doesn't appear to have any relation to what I have eaten, although it is more likely to happen if I've let myself get too hungry. I had my gallbladder removed about 18 months ago, so not gallstones.
I did see my GP, he asked me about flatulence (
) and gave me buscopan, which has made no difference whatsoever.