Thanks for reaching out to us. I'm so sorry to hear about your problems at work. You can use Black Tourmaline, Hematite and Smokey Quartz to protect yourself from the negative energies from your coworkers. I suggest wearing them, carrying them in your pocket or placing them in your office or workspace. Please remember that these stones draw in and hold negative energy, which can reduce their effectiveness as it builds up. Clearing your crystals regularly will recharge them. Here is an article about different ways to do this. Citrine is a great stone for mental clarity and concentration. Use this stone to reduce the distractions caused by the negative energy. Because this crystal also dissipates negative energy, it never needs to be cleansed. I hope you find this information helpful.
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Disclaimer: I must share the standard disclaimer that I am not a doctor and cannot give out medical advice. Crystals for healing should be used as a compliment to other therapies and not as a replacement for regular medical care.