As others have mentioned, this job may not be compatible with your needs. Are you willing to give up this job for one that better fits your needs? You might be able to renegotiate your workload. If you have a supportive manager, talking to them would be the place to start.

Do you consider yourself an assertive person? You will need to start setting boundaries with work. That requires saying No and speaking up for what's realistic for you. This is a skill that will take time to develop but will pay off in so many other areas of your life.