If you are having problems at your job with another co-worker, the first thing you should do is document the issue. Write it down or type it, and keep it in your personal files. You should always document any issues you have on your job along with the date that the issue occurred. Then you should inform your Supervisor of the issue.
If you feel that you are not getting any results after talking to your Supervisor, and your issues are getting worst. Then contact your company's HR Department for more help. If the issue still persist after you have contacted your company's HR Department. You should contact your company's hotline number for advise. If all this fails, write a formal letter of complaint. Include all your incidents you had with your co-worker along with dates. Then send your letter of complaint to someone in high authority with your company. You can also fax, email, or mail it to your company's concern site if one is available.
Unfortunately after taking all of these steps the problem could still exist. The last and final step left is to ask your Supervisor, to move you to another department. If everything fails and you're all stress out. Start looking for another job. You might not want to, but being stress out is very bad for your body and mind. After you found another job and get hired. Contact the "Department Of Labor" and tell them about your pervious job.
It's not easily dealing with these issues, and most people are to afraid to do anything about it. You must speak up and let the issue be known. If you sit and do nothing the problem will just get worst.