I recently had a molar reconstructed with gold inlay (about one month).
 It was originally a deep amalgam filling, which needed replacing.  I
was glad to have the mercury removed.  However, ever since the
procedure, when I drink any cold or sightly cool water (or liquids), The
tooth makes a clicking sound as if it's either contracting or expanding.
 Sometimes there is sight pain for a split second.

Should I be concerned?  If I return to my Dentist, should I expect to
pay additional fees?