What is the Shakespeare quote about needing to express your anguish or it will destroy you?I cannot recall a single significant word that was in it...

Esterlein is correct. The lines appear in Act 4, Scene 3
of Macbeth, lines 246-7 in my edition of the play. Macduff has just
been informed that Macbeth's soldiers have murdered his wife and all his children in
revenge for Macduff's deserting him and going over to the forces being raised by Malcolm
in England. It is Malcolm who speaks the words to Macduff. These lines have often been
quoted over the centuries because they contain a truth that pertains not only to Macduff
but to anybody who is suffering from grief.