Yes, you must alert your bosses that your mental health is hurting because of your persistent extra workload and you are feeling burned out. Do it firmly but politely, without getting too emotional. Typically, it will result in you working within your assigned responsibilities and feeling less pressured. If it doesn't, consider quitting because your health comes first. “Most people in corporate offices live from deadline to deadline, without any time to look over and check if burnout has entered their lives.” — THB