The writer's wall
Sometimes your writing just flows, and sometimes it is like talking to a wall, or like you've hit a wall, or you're banging your head against the wall (or whatever wall cliché you can think of). May I introduce The Writer's Wall. What is the difference between the writer's wall versus the writer's block, you may ask. (Honestly, there probably isn't one, it's just fun to come up with new names for stuff.) The minor difference is that the wall stops you for a bit, the block stops for longer.
My belief is that you cannot let that wall stop you. Waiting for inspiration to bulldozer that wall down might work, but could take a while. If you let that wall stop you, that wall could easily turn into a block, and writer's blocks can be harmful to your belief in yourself as a writer. Most times you need to swing the wrecking ball yourself and keep writing, because there will come a moment that the wall will disappear (or be demolished) and your writing will come to life and start flowing again. The writing might be terrible while you're pushing through, but don't let that stop you either. Anyways, is demolition of walls ever pretty? Keep going. We writers are stronger than any wall or block. We wield the pen.
So raise your pen (physically or mentally), take a deep breath, and start writing.
Many writers say that there is no such thing as a writer's block, that it's all in our head. But still, whether it exists, we have to deal with that feeling of not easily being able to write and how to start writing again.