Just stop, breathe, and read this. We'll get you through it.
1. Go for a walk
If you're far gone enough that you're in danger of throwing a hissy fit or bursting into tears, do no collect $200, do not pass go—remove yourself from the situation immediately and take a walk.
Physically leaving the scene of office turmoil can work wonders for your state of mind. You'll be amazed how relieved you'll feel just remembering there's a world outside your office. And don't doubt the combined powers of sunshine and exercise: together, they're the mood boosting equivalent of the Captain Planet rings uniting. And for even better results…
2. Listen to music
Though it's probably best to avoid the really mopey Radiohead tracks, the cheering effects of music don't really depend on genre. Whether you prefer boppy or introspective songs, studies have shown that music of any kind can help remove you from an irritable, angry frame of mind to a more pleasant "happy-elated" or "soothed-contented" emotional state.
3. Connect with friends or family
Studies have shown that holding a spouse's hand reduces stress, while hearing your mom's voice releases similar feel-good hormones to a hug. So reach out; whether it's scheduling a coffee break with your S.O. or ducking into the hall to call family, do it. Connecting with loved ones can make you feel better on a chemical level, and (perhaps more importantly), remind you that you have support outside of work.
4. Take a coffee break
Getting away from your desk is a great way to perk up anyway, but the caffeine from a trip to the coffee shop can be instantly uplifting as well. Studies have shown that a cup can immediately boost alertness and energy, beating back the blahs. Long term, people who drink caffeinated coffee (vs. decaf) are less likely to suffer from depression.
5. Look at this post on Buzzfeed
No headphones, coffee machine, or time to take a walk? Look at this.