I recently wrote a blog post about writer's block. Here is a little of that.
I've been writing professionally for three and a half years now, and in that time I've met some great authors. Although our writing processes are all different, how we deal with difficulty writing usually falls along the same lines.
-Are you stressed about something? Is life getting in the way? If so, take some time and deal with it. Trying to force a story when you're not in a good emotional place isn't going to work for you or your characters.
-Try taking a walk. It's amazing what something as simple as getting away from your computer and raising your heart rate a little can do to get those mental juices flowing.
-Make sure you're writing the story your characters want told. If every word is a struggle, you need to reevaluate the direction of your story.
-Take a deep breath. Sounds simple, but writing should be enjoyable. You should be excited to see the story unfold on the page. If you're not, you need to figure out why.
-Find someone you can bounce ideas off of. Close friends, beta readers, critique partners...their all good for this. Sometimes all you need is to start talking the story out with someone to get things moving again.