You are certainly not alone in this! The best way I've found to avoid burnout, even with things you enjoy, is to do things in a balanced manner and adopt good habits. Don't spend your life putting in tons of time squashing fires and then zonking out. Do your best to meet deadlines, but accept some consequences and transition towards a more balanced work ethic. Also, don't be too hard on yourself; that just fuels the paralysis. You are human like everyone else.
Read this: http://www.tophatmonocle.com/blog/2010/12/20/avoiding-burnou...