Work can be very stressful. Remember to take conscious, deep breaths. Focus on your breathing, and on the work task at hand.

Something that helps me to get through my shifts is to break them down into blocks. I work 9-5, sometimes 8 hours feels like a long time and like I won't get through. So I'll break the day into 4 blocks:

Around 11am, I take my first break
Around 1pm, I take my lunch
Around 3:30pm, I take my last break
And at 5, I'm done!

It may seem weird but it helps me to break the day into smaller blocks. When I arrive at lunch time, I'm already halfway through and it doesn't seem so daunting anymore. Perhaps that would also be helpful for you?