It sucks to be sick on vacation, even more so at WDW! I know I have been, as been my kids. ER's in Canada might only be for life and death, but in America they can be for other situations too. Even better is we have a number of critical care centers, walk in places to see a doctor when you can't see yours. One is called Centra care in Orlando and we have been twice (any trip you don't need to go to Centa Care is a good trip.) Even then it gets better because of centra care...
They will also send a Doc to your room, but that cost a bit more (like $200.)
Also here, they do chest x rays for pneumonia. :veryconfu
Also it is best to get these things taken care of instead of spreading anything to other vacationers too.
SSR was not open in Jan 2004 (we also went to WDW at that time that year) and stayed at VWL. Maybe you got the year mixed up. Could it be Jan 05?
Anyway, it sucks to be sick on vacation. Sorry it happened to you.