I'm not chronically angry. lol I was pretty content before this disease. Life was going good.
Forgive me for being a teensy bit sceptical - actually, wildly sceptical, to be fair - but it just seems unlikely. I haven't come across one chronically angry person in real life who accepts that they are angry: they're not angry at all, you're just completely misinterpreting their rage-filled tone and expression; or if other people weren't such dumbarses, they wouldn't be angry, etc. etc.
Simple example: years ago, my dad was a nightmare when he started getting back pain, whereas my mum never let having back pain change her. She didn't retreat into a massive sulk for hours on end, being utterly miserable and inflicting that misery upon everybody else too. Of course my dad was never going to admit to having mental or emotional issues in a million years, so instead he became a paranoid, depressive hypochondriac, always having something external to hate.
You have a sense of humour, so that will partly protect you, but it won't be enough on its own.
UC is what it is. In reality, I can think of a million things worse than going to the toilet 10x a day. Just as I can think of a million things worse than having a stoma. I won't stop being pissed off by it, but I do know my reaction to it is not helping and is, indeed, part of the problem.