Hi again Annie
It does sound like your options are quite limited, but as your employer has been very supportive so far, maybe they will let you be a bit flexible for a few weeks.
Would it help if you could work shorter days for the next month and then work longer ones later in the year? Do they have a really busy period when they'd be grateful for you working extra, so they get something out of it?! Or perhaps work one less day a week now and then do an extra hour a day to make it up. (All this assumes they would let you make time up, of course, but if you don't ask, you don't get). Over in the UK, no-one wants to work between Christmas and New Year, so if you offered to cover that period, employers would probably try to help you in return, but I don't know if they have the same problem in Canada.
I had a quick Google for Citizens' Advice Bureau in Canada and couldn't find anything, sadly, but if you know of anywhere that offers free advice, you could always ask them for ideas. And if you have a mortgage, I think it would be worth contacting your mortgage provider to ask if you could defer a couple of payments and extend the term by 2 or 3 months, which would take the financial pressure off a bit.
I know we all try to avoid getting into debt, which is admirable, but asking for help when you need it isn't a bad thing. You've just had a major operation and you should be allowed the time to recover.
Here endeth the lecture.
Take care of yourself.