@annabell1 I certainly wasn't meaning to imply that you could fix your UC with only the kind of diet that helps my son. I only meant to imply that for some people, watching the diet helps - as I know you are doing. I only wish it could help you more.
My sister-in-law has UC and has suffered for many years with it. Nothing seems to help her and I feel so sorry for her - and for you. UC isn't he same as Crohn's and in many ways I think it is worse. Looking at my husband's family, I have to wonder how much the various disorders are associated. There are Crohn's (3 sufferers), Coeliac disease (2 sufferers), Ulcerative Colitis (3 sufferers) and IBS. 2 of the UC sufferers seem to be in remission for long periods of time but eventually it comes back again and they have all 3 ended up in hospital for treatment.Then there are lots of arthritic sufferers and one Lupus sufferer (who couldn't cope with the pain and took her own life when doctors dismissed her pleas for help). Certainly autoimmune diseases are at the back of a lot of it.
With your positive attitude and understanding of what can cause flare-ups, I do hope you can find a way of reducing your condition at least. Don't give up hope of finding a way of alleviating the condition (perhaps using both diet and medication) because the answer may just be out there for you.