This question already has an answer here:
Drush is running on MAMP, PHP 5.6.6.
Additional uncaught exception thrown while handling exception.
PDOException: SQLSTATE[HY000]  No such file or directory in drupal_is_denied() (line 1917 of /Volumes/Doxy/htdocs/omegadoen/includes/bootstrap.inc).
PDOException: SQLSTATE[HY000]  No such file or directory in _registry_check_code() (line 3169 of /Volumes/Doxy/htdocs/omegadoen/includes/bootstrap.inc).
Drush command terminated abnormally due to an unrecoverable error. [error]