I know it's easier to say it than to do it, so here are some tips to help you:
- put your favorite music on and focus your thoughts on the music.
- listen to an audio book
- chat with someone, either face to face or on the phone
- tell your shopping list / menus to someone that can write it down for you (I love to do that with DBF). Extra bonus: 2 brains are better than one and the other person might think to something that you'd have forgotten otherwise!