how much can you pull up your GPA do you think? Could you pull it up to something reasonable?

A good GRE score will help your case. (Canadian universities don't require them but it certainly wouldn't help your case to send your score anyway).

You should get the opportunity to send a good covering letter. In your covering letter you should draw attention to the fact that a couple bad years pulled your GPA down and you should also calculate your GPA for your last year of study / your last couple years of study etc so you can get the best GPA out of your grades that you can.

You could say that you had an undiagnosed condition that affected your early grades but that it had been diagnosed and that it wouldn't affect your future studies.

Good letters of reccomendation would also help your case considerably.

If you are looking at funding your studies yourself and you meet the entry requirements then you should get in somewhere.

If you are applying to particularly competitive programs or are considering applying for particularly competitive scholarships then things might be harder.

As a general rule your last undergraduate year is taken more seriously (weighted more heavily) than your early undergraduate years. They are also more concerned about your major subject than your minors.

Good luck.