Sometimes the boss stresses you out and other times it's a co-worker who's a bully, but no matter what it is you must face it in order to relieve the anxiety that a difficult situation creates. Dumb Little Man wrote an excellent article, How to Deal with a Workplace Bully. I've had mild cases of being bullied. Some people just like to push themselves on to you. They might not even realize that they are making you feel uncomfortable. Try talking to them and making them aware of how they are acting and most likely they will stop. If they don't, then try reading this article and see if you can use some of his tips.
Bullying is a deliberate attempt to control or undermine you. It typically happens over a prolonged period of time and it can severely damage your self esteem and confidence. It can be subtle or overt. It can take place in private or in front of others. The circumstances can vary greatly from person to person. Here are some examples of bullying behavior at work:
A co-worker or supervisor constantly complains to other team members that you aren't pulling your weight. They make jokes at your expense and accuse you of making mistakes you haven't made. In private they constantly belittle, insult and even threaten you. You feel frightened, angry, ashamed and embarrassed.
Most of our stress doesn't come from the work itself; it's the people who we are involved with that cause our stress. Please be aware of how other people are making you feel, and if they aren't treating you right then stand up for yourself or find help.