It's a sinus infection! I'm now loaded up with antibiotics and decongestant and this weird nasal spray stuff that I can only use for three days (if you use it for more than three days, it apparently makes you more congested).
Hopefully, this will work and I'll be on the mend. Fingers crossed.
side note to all my west-coast readers: I will be visiting Portland and Seattle during the next week. Matt and I are leaving on Sunday and returning the next Monday. We've got a busy schedule, but we may be able to find some time for visiting. Just let me know!