sinusitis
"I went to see doctor finally after 100+ days of sinusitis...just thought it was a persistent cold. No bad side effects, at all, but not as effective as I had hoped.  First day (2 doses) I felt improvement after 4 hours.  Day 2 unfortunately, all symptoms worsened (congestion, headache, ear pressure, postnasal drip, coughing). Day 3, symptoms became worse still. Day 4 was nearly unbearble with the worst headache I have had in my 66 years. Ears felt as if filled with fluid.  Not able to sleep at all at night, even with head in elevated position.  Today is Day 5, and I've taken the final dose.  There is some improvement today, and the package asserts that the antibiotic will keep working for Days 6-10, even though no more doses will be taken."