U: Unload your baggage
Feel like venting? Don't bother your co-workers unless it's a work issue that you can discuss constructively. Unleash any negativity on a sympathetic friend. That's what they're there for. Just be sure you're available for them when they need to let off steam.
V: Vitamin up
If you're not already taking a daily multi-vitamin, start now. Particularly helpful for relieving stress are B-complex vitamins, vitamin C and calcium. And don't forget fish oil.
You may also want to research which herbal remedies are recommended for stress reduction