You CAN overcome the frustration of feeling blocked.
Of the 10 tips, I like these two.
#1 "Redefine the problem to find it more compelling. Ask yourself something like "What if Winston Churchill was designing this packaging?" That will provide an unfamiliar angle and perhaps a new perspective. (Christian Helms, Graphic Designer)"
#7. "Choose a better way to conceive of your blocks. For instance, rather than having to root through a blocked drain to achieve flow, consider temperature. "I try to find out what's hot and start there, even if it may be unrelated to what I need to be working on." (Michael Erard, Writer and Journalist)"