You may have an allergy if it is only occuring at work.
You may want to try some non-sedating anti-histamines sold over the counter - Claritin or zyrtec. A good steriod nasal spray (nasonex, flonase) as well as antihistamine nasal sprays (astepro, astelin) may be helpful as well. The nasal sprays are prescription only.
Would you like to video or text chat with me?