Hi Roundthebend4, really sorry to hear about your DS. I have UC but am older than your son. I feel really sorry for him having being diagnosed so young, must be so tough on him, poor kid.
It was a big shock to me when I got diagnosed and as I say, I was older, so I can only imagine how you are all feeling right now.
I hope they are able to start some kind of treatment for him soon that will make him feel a lot better.
I guess my only advice is that there is so much conflicting advice out there which makes it a tough disease! All sorts of websites/forums/people tell you that if you should stick to this kind of diet with UC but then another tells you the exact opposite. One thing I have always found a bit frustrating is that there are no exact answers. I've always wanted to know exactly what I should/shouldn't eat during a flare up; well it varies from person to person. Something I can tolerate might be really bad for your DS.
I've had a range of different treatments over the years. I've had long periods of it being really well controlled and then other times where it's played up a bit. But hey, I have a beautiful DD, have travelled, played sports, go out with friends - normal life apart from times when I feel the need to take it a bit easy.
I've written you an essay here so I'll stop now but if there's anything you want to know, I'd be happy to share my experiences with you if it were any help.
Best wishes to you and your family, really tough time for you all.