Overwhelmed at Work

My current model is: C-mutilple deadlines, hearings and clients are requiring immediate attention. Thought, no matter how hard I work I can’t get ahead (working 16 hour days). Feeling Defeated. Action. Stop pushing. Result. continued backlog of work.

I am struggling to find a new thought. I do not control my deadlines they are statutory in nature. I am an attorney. How do I change this thought to help push through the work load?