I wonder if anyone has had something like this.  The doctor is
baffled:

I woke up one morning and when I moved my hand I got a severe, sharp
pain in my wrist.  It was in the upper wrist on the side under the
pinky.  Moving my thumb made it worse, but twisting or any upward
movement of the hand also caused pain - very bad pain.

The orthopedist took x-rays and an MRI.  All negative.  He figured it
was tendonitis and had me use a brace full time for a month.  At the
end of the month it was improving.

I am going to PT and it has improved a bit more but not much.  The
pain still occurs when I twist the wrong way or over use the hand, but
not as severely.  I can use the hand most of the time but have to wear
a wrist wrap.

The mystery is, every morning when I wake up the pain is back and
almost as bad as it was the first time.  After icing it, it feels
better.  As the day goes on it feels a bit better, provided I don't
aggravate it by doing something stupid.  I tried sleeping with the
brace, without it, with the wrap.  Pain is still the same in the
morning.  When I sleep my hand and arm are not twisted or under
anything.

Now they don't think it's tendonitis but have no idea what it might
be.  Apparently the fact that moving the thumb upward causes pain on
that side is unusual.

All this started 3 months ago.