No, you cannot sue. There is literally no limit on how hard your employer may work you--they can require your to work 24/7/365. There is no limit on how stressful they can make your job, either. Since they may legally work you as long as they like and put as much stress or responsibility on you as they want, you cannot sue--you may not sue people or businesses for doing what they are legally allowed to do.A company or employer, quite simply, does not need to care about yorur stress or if you are burned out, and does not need to set priorities. Under "employment at will," they can make the job as unfair, difficult, or unpleasant as they wish, and your only recourse would be to find a different job (i.e. you are not required to stay with them).