For those of you who were concerned about my vision issues, the resolution:
I recently got more powerful glasses and contacts. I also have an eye that tends to be focused inward. Apparently when one's vision is less than completely corrected, your eyes tend to point outward (therefore, my doctor explained, people who have eyes that drift outward are sometimes given overly-strong prescriptions to force their eyes in). My old prescription provided less than complete correction and thus pushed my inward-focusing eye outward. My new prescription pushed it further inward, making everything wonky and horrible. So, theoretically, things should return to normal after I go back to my old prescription .