I've submitted my story to irritablebowelsydrome.net which I think may help some sufferers.
The short version is that for over two years now I've been suffering from IBS and painful nighttime colon spasms, then a couple of weeks ago I forgot to take my statins and had a much less troubled sleep. I stopped taking statins altogether and my IBS and nighttime pain has gone completely. I feel like I'm back to normal.
I wonder if any of you have had a similar experience?