If it's swimmer's ear, there's a great product called Aqua Ear you can get in Australia. I'm not sure if it's available in Canada, but if it is, get some. It worked a treat when I swam a lot.
But you should definitely go to the doctor. They'll probably just give you some drops or flush it out or something, but don't muck around with your ears. They're fragile.
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Strewth
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