By "blocked" do you mean stuffy as in you have a head cold?  I went for
years like that, it was similar to having water in my ears.  Finally I went
to an ear/nose/throat/allergy doctor and had the MRI, hearing tests and
allergy testing.  Nothing really stood out but they did find I had some
relatively mild reactions to tea, and pectin containing fruits, odd.   Sadly
nothing they did or "found" or didn't find has had any effect on the ringing
or the stuffiness.  I just stay away from the items I have identified as
increasing the "stuffiness".   I have found that when the stuffiness gets
real bad I can get some relief by using  91% isopropyl alcohol which is the
product recommended for swimmer's ear.   Apparently this sensation of
"blocked" just comes along with the tinnitus.  Keeping a radio playing in
the background helps a little also.

I have not but I have observed others who have in China.  An old lady
simply lost her hearing overnite after losing her temper with her
servant the previous day.  This phenomenon is called nerve-typed
hearing loss or nerve-typed tinnitus.  It has everything to do with the
nerve.  So perhaps your doctor is right that there is nothing that
blocks the ear but something is blocking the nerve.

The conventioal methods used for treating nerve-typed ear problems in
China are intravenous injection and hyperbaric oxygen chamber.  The
Chinese doctors pick these up from the European doctors, while their
own traditional method is acupuncture.  The Chinese applied acupuncture
to treat nerve-typed tinnitus and hearing loss problems about 3000
years ago or 1000 years before they built the Great Wall.

If I were you , I would take a tour of Peking.  While the other
tourists climb up and down the Great Wall, you go and visit an
acupuncturist in a state hospital.  The cost per treatment is less than
US$10.  If something clicks, you go and visit the same specialist the
second time and ask him or her to jot down the various energy points
into which he inserts the needles.  Then you bring the instruction back
to the acupuncturist that graduated from places such as UCLA and
continue your treatment back home.  A method that works for one does
not necessarily work for another.  But try it anyway as you seem to be
desperate after running out of good doctors.

Forget about all that micky mouse 'controlled' studies on gingko and
acupuncture.  Most of these studies were performed by frustrated
graduate students who are running short of topics upon which to write
their ph.d thesis.

FP