Guess they modelled the canadian system on the UK disability living allowance! Sounds like just the same kind of hoops to jump through. I know with our forms, it isn't so much about what you say, its about what NOT to say. Yes, describe the bad days and the worst case stuff, but NO, definitely don't ever admit that you can cope even some of the time. One silly little statement that implies you can cope can negate everything else you write.
I'm in the middle of filling out my renewal forms right now. Its so stressful.
Do you have the right of appeal? If so, then that is where your diary might be very useful.
