The point of this list is to help people with mapper's block (if there is such a thing).Yes, there definitely exists something like a 'designers block'. Best is to just relax, delay the map for a while. Start with something different, just don't let yourself get stressed. After all, you're not forced to finish a map, even though that may seem the case so often.
It often happens people have an idea and start mapping on that immediatly. In most cases, I have horribly failed with this method. Now, I draw out my idea's and start to think of what else could I add. To me, this is really helpfull. It also helps me structure my work process better. Then again, maybe you're different and this doesn't work for you, but perhaps it's worth a try, to draw not only the idea but also a possible layout, and see, on paper, how it could play.
Most professionals work by this way. Maybe it doesn't work immediatly, I didn't do it when I just started but I've grown into it.
Perhaps this can help you? I hope so...