Chocol8 - re the exploding bottom - yes, I certainly know what you mean, sadly... I think it could also be caused by a bug though too - do you have any other symptoms like eggy burps, say? Well, the colonoscopy should give you a clearer idea, hopefully.
Thinking about the diet mentioned above, there may well be something to it - when I had my first (and worst) attack of UC, it spontaneously healed at Passover (I'm Jewish) when I eat a very restricted diet for religious reasons, containing, funnily enough, no grains (except a small amount of matzah = crackers) plus lots of meat, fish, and ground nuts, and fruit/veg. Everything is home made and unprocessed, more or less. Normally passover food would contain dairy, but because of the colitis that year I was avoiding dairy. So I probably did eat pretty close to the diet described (though with limited fruit/veg initially, and added matzahs which contain wheat flour). Maybe it's the fact that everything is unprocessed but I have found in the past that the Passover diet does leave me feeling feel of energy and vim, and quite happy too. :)
So, esp if you're up to the veg element, give it a go, Chocol8?
The only thing i would say is it does get v dull :( - Passover lasts 8 days which is about as long as I can keep it up...). You do long for some bread or rice or pizza or whatever.
Maybe I should try it - my breathing is a bit better but I feel astonishingly knackered, which is not good as I have loads to do...
Hope you're feeling a bit better today, KatyMac.