“Look, I don’t know what to do, Justin’s having some kind of attack and he refuses to go to the hospital so he’s stuck his head out the window

Whoop! I think we have a winner! :) I found it under the "ethan calls brian to help justin" tag. J's having an asthma attack, pretty sure caused by allergies. It's by jane2005 but I'm not even sure the fic has a name.

http://jane2005.livejournal.com/57707.html
http://jane2005.livejournal.com/59684.html (part 2)