Thanks, everyone, for your comments about my knee. I'm taking your advice (and the advice of my husband) and will be calling my doctor in the morning. I don't know how knowledgeable he is about sports injuries, but I'm hoping he will at the least refer me to someone who is.
I really appreciate what you all had to say. I've said it before, but I'm going to say it again... the running community is amazingly supportive!
I'll let you know how the doctor's visit goes.
And Mark, thanks for deciding to not buy that house for me. I'm certain you saved me from certain doom during the next big storm. :)