Wow Mads that's harsh, sorry to hear you need another major op! I'm only 5 months out from take down and i dread the thought of having those sorts of complications (fortunately I'm fairly good so far).
I'm hesitant to provide support because i often say the wing think lol I don't mean this to be patronising in any way but...
I'm 40, i still feel like a teenager, I've worked with my employer seventeen years, before that i did a years traveling and before that i was at college and university! 20 years ago (About your age) That seems like a lifetime ago. It was before colitis was fully understood, at least in the UK where everything was IBS, s o was ill and in pain, worried to leave the house.... The usual..... Sometimes i wondered if It was worth it. My point is someday you will look back on this moment, this operation and remember and it will be a distant memory.
Being 20+ is great, you have money, buy a house, travel the world, get your dream job, partner/kids whatever. again my point is you have a lot to look forward too.
Your young and healthy so should make a good recovery, and your in a time and place docs can fix your issue! It's horrible in the short term to need to be cut open again, you will need to be tough and dig deep, but it sounds promising and you don't sound like your in a great place at the moment. The op itself is a relatively short process, and you already have the after affects (pain and frequency), so your probably not got a lot to lose?
Head down and plough on through! Wishing you all the best, please keep us updated x