I have the same feeling. I sit at work and have lots of ideas for things I'd love to code, but at the end of the unproductive day in the office, I feel so burnt out that I don't have the energy anymore.

I still hope to eventually find the right mode that will work for me, though. Probably that will involve working on my own projects...

Also, I plan to take on a project I can work on from home as my next freelancing contract, where I have most of the responsibility for the design and architecture of the application. What is killing me among other things are many of the unfortunate design decisions in the corporate world.