1. Read the hilarious but empathetic chapter on writer's block in Anne Lamott's must-have book Bird by Bird. She begins with: There are few experiences as depressing as that anxious barren state known as writer's block, where you sit staring at your blank page like a cadaver, feeling your mind congeal, feeling your talent run down your leg and into your sock. At least you don't feel quite so alone.
2. Go for a walk. This sounds asinine, and it might not work for you. But I've found that extra oxygen to the brain can work wonders. I have a five-mile loop, myself, and by the time I've finished, I'm ready to roll. I don't always remember every brilliant line or detail that I cleverly crafted, but I've had the chance to reassure myself that I haven't lost it, this precious golem I keep on a string.
3. Listen to a podcast. Not any podcast, of course, but one that inspires the writer in you. My favorite are from Odyssey: the Fantasy Writing Workshop. (If you have money, time, and writing talent, apply for their 6-week writing workshop. It looks phenomenal.) They have such writing greats as Patricia A. McKillip, Rodman Philbrick, and Jeff VanderMeer doing their guest lecturing, as well as editors like Gardner Dozois.
4. If you're really stuck, consider taking a true breather and pick up Christopher Vogel's The Writer's Journey. When you need to hit reset, take time out and re-evaluate, step back and look at the big picture, this book can help remind you of the epic structures of storytelling. This doesn't mean you're betraying your craft or concocting a cookie-cutter novel. It just means that you acknowledge a greater theme that ties humanity together and you're interested in universal truths.
5. Slog through it. Sometimes the only way to conquer Writer's Block is to bulldoze your way through it. Keep typing. Keep writing. Keep your fingers moving. Force yourself to sit there and slog your way through it. Yes, it's painful. Yes, it's dirty. And, yes, you'll end up deleting most of it later on down the line. But, sometimes, it's the only way.
Sometimes you are the only one who can rescue you. You have to get out the shovel and the sandbags, and dig your way out, sprinkling down a layer of traction as you go. You'll be sweaty and muddy, but oh so exultant when your tires finally wrench free. Go forth and conquer.