You might have to get a new note dated the 26th. They are very strict about that. You have to apply for medical EI as well, as the other one is for lay-offs, etc. i have been on and off medical EI a ton of times in the past few years. Once you run out, if you still can't work, you would have to apply for provincial social assistance (medical welfare).

Honestly every time I havd had to fill out my highest weeks, I guessed, and they never had a problem.