I'm sorry, stressful work environments are really tough to deal with. We spend so much time at work... that when it's bad, it really (for me, anyway) drags down the rest of my life.

One thing that seems to help me is to get away for lunch. Leave the computer, leave the cubicle and desk, leave the building if you can! If you're an extrovert, try to arrange to go out to lunch with friends or do something with people. If you're an introvert, get away from everyone and find someplace peace and quiet where you can hide out, read a book, meditate, stretch, walk, etc. I like to exercise at lunch time to help burn off the stress chemicals if that's an option, even if it's just a walk. Or, find a local place that has yoga, meditation, or a lunch time lecture, concert, or class that's not related to your job.

For me, the "getting away" part... physically and mentally... feels like it helps a lot. It helps me reset my brain, reminds me that there's more to my life than the crappy job, and just helps me break up the long day and feel better. When I don't get away, the day feels so interminably long... it's almost physically painful.

Obviously, anything else you can do to add fun to your week after work would be helpful too.

Other than that, I try to remember to pause and take some very mindful, slow breaths while I'm working (or take a stretch break!), to clear my head and mentally remove myself from the stress.

And, when all else fails... honestly? I look at other jobs on my computer while I'm on conference calls. It's terrible, but weirdly makes me feel better!

I hope things get better for you soon! Try to keep up with your self-care outside of work if you can (good healthy food, plenty of sleep, etc.) too... to help from getting over-frazzled.