hmm... does canada have disability checks like the us does? if so i'd start there... it'll probably be a long trecherous battle, but if your pain is as bad as you say it is, and your doctors can back you up, eventually you'll get it...

could always go to college to become a webpage designer or something... one of those comfy-chaired jobs where you sit on your ass all day in front of a computer.... (i dunno about up there, but pharmasists are always on their feet down here... so i'm not so sure that would even help you out...)

start researching for real work-at home type jobs... there's a whole lot of bullshit out there, but there are some programs that are real, and do work... you just gotta find the right one (if you send money to them first, then no, don't do it... just another scheme)

could go to one of those carrer schools to become any number of things, one being medical billing...

there's lots of things you can do, you just gotta figure out what suits your needs, and what will work for you.