So far:  10 days of antibiotics   Now: Anithistamine and another
antibiotic.

Nothing to open up the channels or assist in the drainage yet?
You will find that lots of people here have had good luck with
irrigation to loosen things up, either the waterpik or some other one.
I use Neilmeds sinus rinse with distilled water and heat it up to 100
deg F so it pretty much matches body temperature.

Some other things, not sudafed, I often use as a decongestant
substitute:
Hot steamy shower,  Burger Kings onoin ring sauce, Spicy hot chili,
Dentyne ice breaker gum,  Vicks rub on the neck, Benzedrex Vapor
inhaler, Personal Steam inhaler (Keep it as sterile as possible).  Get
the idea?  All of these have a good short term decongestant effect for
me.  Taking an anti-inflammatory about one hour before any of these
helps a lot, Motrin 500mg.

If you have any suspicion of allergies aggravating the problem, do a
home allergen survey.  Pets, down feather bedding, old furniture, damp
basement, excessive dust, check your pillow (I replace my pillow every
3 months), latex (many foams contain latex and you might be allergic to
it).   I found out last year I had a latex allergy and had to test all
things in my house to see if they contained latex.  I found out I had a
latex allergy when wearing latex gloves (like the ones in a lab or at
the doctors office).  After about 10 minutes I started itching, I
pulled off the glove and washed my hands.  They were red with a pretty
good case of contact dermatitis and some hive like rashes working up my
arms.  Took a benadryl, washed them off a few times, and all was well
again.

Good luck.  It will take some trial and error on your part along with
the best efforts of the Doctor to find out exactly what will work best
for you.

My suggestion to you is try a sinus rinse and have the ENT office show
you how to use it once, ask them about a personal steam inhaler (they
may say to go ahead and buy one and use it before the appointment if
you call them). In the meantime, try vicks vapor rub on the neck for a
few days, take some long hot showers and really try and clear out the
sinuses, remove and wash all your bedding material every day (make sure
you have a NEW allergen free pillow and no down feather bedding).  One
other hint on your cloths and bedding, you might be allergic to the
laundry detergent or softening agent being used.

The sooner you start getting the sinuses to drain out, the sooner the
antibiotics will be able to resolve any infection.  Most people know
that antibiotics can clear up an infection, but if the sinuses are not
open and draining, infection is very likely to come right back.  It is
kind of a catch 22, the infection causes swelling that prevents good
draining, the swelling prevents good draining and breeds infection.
Both problems need to be resolved for long term relief.

Allegra can cause some insomnia, as can a persistent headache.  Try
changing when you take it, especially at night.  When I first started
allegra it would cause some acid reflux if I took it too close to bed
time, which would cause me to wake up.