About three weeks ago, I washed (and dryed) my hair and a few hours
later went outside for 3 minutes in the cold air to look at the XMas
decorations my family had put up. The next morning I woke up with a
sore throat and a 99.8 degree fever.  The fever subsided with aspirin,
but the sore throat did not go away.

Went to the doc who ruled out strep, and took a chest X-Ray and ruled
out pneumonia. I did not really have nasal congestion (I thought) but
the doc said my sore throat was due to post-nasal drip, and diagnosed
me with sinusitis.
I was given Biaxin XL which I finished, Alegra D (which I did not take
b/c It gave me a headache), and the sore throat went away immediately.

Monday, I accidentally forgot to cut the heat on overnight, and my
house was freezing cold, and I woke up with another sore throat, but no
fever.

I'm taking a Tri-Pac of Zithrom, and it's the second day and the
sore throat is still around..Help, what should I do now?