What is something physical you enjoy? I'm not the best at following this advice, but find something physical to do. I stink at golf and archery, but I do them occasionally and it really helps. I love rowing, but where I live there's no place to do so.
What are your 'official' work hours? i.e. Mine are 7:15 - 4:15. I have the band hall open at 7:15, I throw the kids out at 4:30, and I try to be out of here by 5:30. That gives me an hour and 15 minutes to do any wrap-up I need to do. If it isn't done when I leave, the nice thing is it'll wait for me to come back the next day.
Take your (insert curse) (insert epithet) (insert yo'mama joke) work email off your phone/tablet, and DO NOT ANSWER WORK EMAILS outside of your business hours. That's a huge source of stress and it almost drove me clean out of the business.
Set limits on your work time. This job will expand to fill all the time you give it. If you give paperwork 30 minutes, it'll fill 30 minutes, but you'll be more efficient. If you don't give it a limit, 4 hours later you'll still be working paper.