I've got this sore on the side of my tongue that hurts bad and has been there for a few days now. I didn't bite my tongue or anything so that can't be it. It's not white/discolored either, just a sore swollen spot. I also have a sore throat, hurts to swallow, etc. Any idea what this could be? I've heard a combination of sore throat/sore tongue on just one side can be tongue cancer...

As a side note, for about a year I've had a white coat towards the middle/back of my tongue. A tongue scraper gets it off but it's back the next day.