Hi Patrick,
I am bit confused, but could you not get the comments from TABLES and TABLE_COLUMNS
select table_name, comments from tables where table_name = 'my_table_name';
select table_name, column_name, comments from table_columns where table_name = 'my_table_name' and column_name = 'my_column_name';
It works for me.
OR
Are you looking for something else.
Regards,
Ravi