If you are really having difficulty, there is one food which can help you to let go: Chocolate. Chocolate imparts a sense of love and acceptance that helps you to transmute any feeling into pure energy. That energy then fuels your spirit and brings you up even higher. Let chocolate show you how to allow and let go.
Listening to highly inspiring music, or whatever music that moves you, can also greatly increase letting go ability. Just connect with that feeling of freedom and joy and match that with whatever negative feeling you are experience and watch it dissolve naturally. Certain feelings, however, will be more difficult to accept initially but they can still be let go. Music can make it much easier for certain people.