Yeah, I've been there and felt the same way. Your best bet is to either find a different job, or one thing that can help a lot is just take a vacation. I was working on a project for months and months, and every few months some new requirements would appear. It's easy to feel unappreciated at a point like that. What really helped me was taking time off and working from home. A week or two of relaxing can really help you jump back into your dreaded project with a fresh perspective and not feel burned out.
I agree, this is primarily why I'm leaving my current position for a company with realistic expectations. I've had months without a single day off working 60 - 90 hour weeks every week because they refuse to compromise with deadlines or adding additional developers. I'm planning on taking a few weeks between jobs to just unwind so I'm not frazzled for the next position.
