What Do You Do About Dry Periods In Your Writing?

When the writing is going well,
I am a prince in a desert palace,
fountains flowing in the garden.
I lean an elbow on a velvet pillow
and drink from a silver goblet,
poems like a banquet
spread before me on rugs
with rosettes the damask of blood.
But exiled
from the palace, I wander --
crawling on burning sand,
thirsting on barren dunes,
believing a heartless mirage no less true
than palms and pools of the cool oasis.