hrmmm... in the fic that was just linked, Justin does have appendicitis, but his appendix hasn't burst. I'm kinda thinking there may be another fic out there that's an appendicitis fic.

I know in quinn222's Fall (which I don't think she's reposted), it's Brian with the bad appendix, but I think I've read another one that's about Justin.

Joker, is the linked fic the one you were thinking of?