Stress STRess STRESSSS

My boss is a complete meanie and not in a boss type way but as a person overall! She shows EXTREME favortism to certain employees ( which happen to be people she hired from her personal life) and its out of control. They are allowed to do whatever whenever when the rest of us get reprimanded for the exact same things! Then we have to work twice as hard to pick up their slack. She is beyond rude and finds any excuse to ruin your day and make your attitude horrible. I can feel the stress taking a toll on me as i start cramping every time she gripes at me! I feel she could end up adding so much stress... I could have serious complications... Thats just how bad it is!!! What should i do... Talking is out if tge question everytime ive tried it gets worse