I posted the following in a previous post, but wanted to post it again
for those who may not have seen it and keep having chronic problems.

PLEASE DEMAND (or request, most ENTS don't like demands) ENDOSCOPIC
CULTURES IF YOU KEEP HAVING SYMPTOMS AFTER BEING ON ANTIBITOICS FOR A
WHILE. (mucus that you blow out or cough up won't usually show what is
actually in the sinuses.)  DON'T JUST GO FROM ONE ANTIBIOTIC TO
ANOTHER.  I THINK THERE IS SOME DANGER IN HAVING THEM DONE SO THAT
PROBALBY SHOULD'NT BE A FIRST OPTION (SOME ONE CAN CORRECT ME IF I'M
WRONG).  EVEN IF THE ENTS SAY YOUR CT SCANS ARE CLEAR, ask for THE
CULTURE IF YOU HAVE TO PAY FOR IT YOURSELF, BUT MAKE SURE YOUR'VE BEEN
OFF OF ANTIBIOTICS FOR A WHILE. I'VE HAD 3 UNUSUAL "BUGS" CULTURED OUT
WITH SUPPOSEDLY NEGATIVE CT SCANS.  IF SOMEONE WOULD HAD DONE A CULTURE
YEARS AGO AND LISTENED TO ME INSTEAD OF TREATING (OR NOT) A CT SCAN,  I
MIGHT NOT BE IN THE SHAPE THAT I'M IN.    DON'T LET YOURSELF GET IN
THIS SHAPE.

(I now have a resistant bacterium and am on IV antibiotics and am not
sure it is going to help. I'm now up in the middle of the night with
drainage so bad that it about suffocates me. But when it doesn't drain
the pain and pressure are unbearable.)

BTW, I've been to Mayo as well as several other places and agree with
other posters that you need to find someone who specializes in
sinusitis.  From my experience most ENTs only want to do surgery and if
they don't see something that needs surgery, then you don't have a
problem.  Most infectious disease doctors don't want to deal with the
sinuses, period.  At least that has been my experience.
My experience with Mayo was both good and bad.  I was there twice.  The
first time an allergy doctor did the endoscopy and saw the purulent
drainage. He was the first to suggest chronic sinusitis.  I was on
antibitoics and didn't get better and went back and saw an ENT who just
looked at the CT scans and said I didn't have sinusitis. He didn't even
do the endoscopy.  He practically said I was lying about the first
doctor (who wasn't there the 2nd time.)  I had to show him on the
computer, the allergist's notes, and he still didn't believe me.  Like
Steven, I eventually had sinus surgery and had considerable ethmoid
disease.  But I didn't get better for long.  I even went to National
Jewish because I was coughing up brown stuff.  They did a more detailed
CT scan that showed "mild ethmoid chronic sinusitis" with reactive bone
formation. However, my enodscopic exam there looked normal, so it was
pretty much dismissed except for being told I needed to use Flonase.
I later got copies of the report that had an additional comment that
was not on the report that I first received that said this possibly
represented old osteomyelitis (bone infection) which is what I have now
been diagnosed with.
  One other point.  Most doctors order "limited" CT scans of the
sinuses that may miss something, so you may want to request detailed
scans.  Also, make a point of getting the records and reviewing them
yourself.  Educate yourself, but don't make the doctor(s) think you are
diagnosing yourself.  They don't like that either.  Just be informed
enough to ask good questions.
  You know when you are sick!!  It's a shame that we don't have many
doctors anymore who actually listen to a patient's symptoms and use
that as part (not all) of their diagnosis.

GOOD LUCK TO ALL!!

KATHYW