Yes to the things the others have said!
My job is all deadline-based, so that's where my stress comes from. For me, controlling my stress level has been about learning to say 'no' to those little extras people so often need, and to flat out turn down work when I'm at capacity (normally I work like a dog, then crash and recharge, but that recharge isn't going to be possible, so I have to throttle back.)
I also walk to and from work, and on all my breaks, even if it's just around the block. Getting out of the building really seems to help, and I decompress on the walk home.
The last thing for me has been making sure I have good food. I'm a pot noodle kind of person sometimes, especially when work is crazy. It just makes me crabbier and more tired. Healthy stuff (even just a sandwich with fresh lettuce and tomato instead of cheese all by itself) really helps.
Oh, and water. I would drink tea and coffee till I dropped dead, but wired and tired is no way to feel.