[ddavidn]

I'm 27, have had a great job for three years and very recently dropped into this weird "stuck" state that feels similar to what you're describing. I feel like a robot that gets up every day, goes to work, goes to bed, repeats.

I don't think the answer is the same for everyone, but my best times have been when I was helping someone accomplish their dream company/project/etc. Self-employment wasn't fulfilling for me in the way I had hoped, but sticking with someone who has a great vision for something and being their support really helped me to feel momentum for myself. Doesn't matter if I was making lots of money, or just following the project and offering my opinion when asked.

My advice would be to seek out an opportunity, however small, to find something that has meaning and momentum. Mentally put your office work on autopilot, use your energy on the nights and weekends to find interesting people and offer your unique perspective on what they're doing. I'm not out of the woods yet, so take my advice (and all the other posters') with a grain of salt. Hope this helps. Let us know how it goes.

Edit: The thoughts Derek posts over at sivers.org have been very inspirational to me as well. He'll even answer your email if you ask him some questions.