Blurred vision in my left eye?

I've noticed that within the last several days (a little less than a week, maybe?) my left eye has been kind of blurry. I wear contacts, and whether I'm wearing contacts or glasses, it's blurry. Usually, both of my eyes are just fine when reading up close (I'm nearsighted), but my eye is even blurry then. Things seem to double a little (mostly text), but I think that could maybe be my mild astigmatism? For most of the days I've noticed this, my eyes felt like they were dry or had something in them, but it seemed to temporarily subside when I used eye drops. Now, they don't hurt at all. Also, the skin below my left eye (my upper cheek) and the area below my right eyebrow have been pretty tender and kind of red for the last couple of weeks. Could this be related? What could be causing this relatively sudden blurriness?