when you get writers block it usually comes from writing too much in a usually short period of time, your best bet is to relax for abit take a small break from writing and just sit, not thinking and just write random lines out, it gradually opens your creativity again but at the same time, it lets your brain rest, take a break and chance to re-group so to speak and also allows you to have time to see stuff, take things in or w/e so your brain has new things/concepts to play with aswell..... thats what i do n the way i look at it.

i went to bed last night un-able to write a damned thing, and today ive written 4 songs, all verses better than anything ive written before it