I feel wrung out.
I've been part of a large update of systems at work and it has been several months of pressure. Normally I work really well under pressure, but this time there was so much and for such a long time, that more than once I wasn't sure if I was going to make it to the end.
I've always looked at the end of projects as a time when I can feel positive and invigorated and ready for the next one. This time I'm feeling like I want to crawl onto a warm rock somewhere and have someone bring me cold fruity drinks for a few weeks. Preferably alcoholic drinks. Very alcoholic.
But regardless of how I feel, the project is done. And that's a good thing.