I must say, the two day medication vacation was very successful. I felt better during the last two days than I have for several weeks.
I suspect one reason the antibiotic was hitting me so hard this time around is because I was taking painkillers for an increasingly uncomfortable toothache. I'm not sure if there was any drug interaction, but I should be able to find out now. I made my way to the dentist yesterday, and he found a cracked filling that had allowed significant decay underneath.
My tooth feels much better today, so I should be able to forgo my daily Motrin routine. As I start back in on my antibiotic in just a few minutes, hopefully things will go a little more smoothly this time around.